Think of a Sherman tank like a car. You can paint it a different color, buy new rims, add a sunroof, or even buy the upgraded model with a bigger engine, but they are all the same car. Owners mix and match all these features and more, but all of the resulting cars are still the same model.
I presume you are asking about an M4A3(76)w VVSS (as opposed to HVSS).
The upper hull, engine deck, exhaust system, and engine deck door props are specific to the M4A3--other variants differ in these features. (Note that the upper hull of a late model M4A2 is the same as the one in your kit accept for the angle of the tail plate.)
The wheels on a VVSS Sherman are interchangeable from the earliest to latest models, like the rims on a car, and vary from tank to tank. For such a late model tank, the pressed, 6 spoke wheels (they are solid with six spokes; no holes) are the most common. Your best bet is to consult a picture and use whatever that vehicle has. In some cases, you will see a mixture of types.
The bogie housings on a VVSS Sherman are interchangeable from earliest to latest models, and vary from tank to tank. There are three major variations--a truck with the return roller directly above, a truck with the a flat arm on one side holding the roller, and a truck with a raised arm on one side holding the roller. The trucks are interchangeable from side to side on the real tank. The arm assemblies with the rollers bolt to either side of the truck, as appropriate. Normally, the return roller assembly bolts to the back of the truck facing the back of the tank, but occasionally you see one oriented in the other direction. On a late model Sherman, the truck with the raised arm and roller at the back is typical. Your best bet is to consult a picture and use whatever that vehicle has. In some cases, you will even see a mixture of types.
The skids on top of a VVSS bogie housing are interchangeable from earliest to latest models and vary from tank to tank. There are three types: symmetrical with a bump in the middle, offset with a bump to one side, and overhanging one side. The latter is the latest variation and by far the most common. Skids never appear on bogie trucks with the return roller directly above. All three skid types will fit any variation of the later trucks (side mounted return roller on straight or upswept arm). Your best bet is to consult a picture and use whatever that vehicle has. In some cases you will even see a mixture of types.
Sherman transmission covers (the nose of the tank) are interchangeable from earliest to latest models and vary from tank to tank. Technically, each transmission cover goes with a particular transmission, but this is not an externally visible feature. On a late model tank the 'pointed', single piece transmission is the most typical by far. Your best bet is to consult a picture and use whatever that vehicle has.
Any version of the M4A3 as described above can use any Sherman turret--75mm, 76mm, or 105mm. However, the internal arrangement of the tank varies with the turret; one cannot arbitrarily switch turrets in the field.
Shermans with the 75mm turret come in two major variants: wet and dry. This refers to the method by which the ammunition is stored and WHERE it is stored. On a dry stowage tank, the ammunition largely resides in three racks in the sponsons. It was discovered that penetrating shots often hit these racks, setting off the ammunition. The quick fix for this problem was to weld three patches on the sponson sides over the racks. After the first year of use most dry stowage Shermans exhibit this feature as a field modification OR factory applied fitting. Later, wet stowage tanks were introduced. In these tanks, the ammo was moved to bins on hull floor surrounded by a liquid bath (for fire suppression). Wet stowage tanks do not have ammo rack armor patches.
I will not discuss further variations on the 75mm turret since they do not apply to your situation.
Shermans with the 76mm turret are always of the wet variety--no ammo rack hull patches. The 76mm turret comes in two major variants--one with a ovular, single piece loader's hatch and one with a round, two piece (split) loader's hatch. Both variants are common through Korea and beyond. Your best bet is to consult a picture and use whatever that vehicle has.
The commander's station features a copula that comes in two interchangeable types: a flat, rotating ring with a two piece (split) hatch, and a tall, fixed ring with vision ports all around and a single hatch (vision copula). The vision copula was introduced later and is common to almost all late model Shermans. The vision copula is normally mounted with the hatch opening to the right rear (with barrel to North, SE position) but some crews changed this, usually so that the hatch opening to the right (East position). Your best bet is to consult a picture and use whatever that vehicle has.
The 76mm gun comes in 4 interchangeable types: a smooth barrel all the way to the muzzle, a barrel with the muzzle machined to accept a muzzle break, a barrel with the muzzle machined to accept a muzzle break and sealed with a protective ring, and a barrel with a muzzle break installed. All types are common on late model M4A3 tanks so your best bet is to consult a picture and use whatever that vehicle has.
There are many other small points of variation on Shermans--tool stowage, siren, front track guards, light plugs, antenna configuration, commander's machine gun mount and position, and so on. Again, your best bet is to work from a picture.
If you want a generic, M4A3(76)s VVSS use these features: pressed, 6-spoke wheels, bogie with raised roller arm to rear, overhanging skid, pointed, single piece transmission cover, vision copula. Oval or split loader's hatch is fine. Any barrel is fine--in my opinion the muzzle break makes the tank look more ominous.
As for the return rollers in the kit, I believe one set has two depressions in the edge of the roller (not the hole through the middle), and the other set has four. I believe the latter are more accurate, but once mounted you cannot really tell the difference.
-Doug