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You don't need both turret bases. The supplied turret base fits both turrets. ( As I sit here in front of the computer dry fitting the pieces together)
It fits the high bustle better though. The low bustle turret is strange in having nice cast texture all around and a totally smooth rear.
The base fits the high bustle turret, but the bottom face of the part is too low. The purpose of the high bustle was to allow clearance for the larger driver and bow gunner's hatches--with the low bustle, the hatches couldn't open if the turret was reversed. The correct base for the high bustle turret sits higher, and the hatches would be able to open on the real vehicle.
When a batch of early turret shells left over from the M32 conversion program were mounted on new M4A3 tanks by Fisher in late 1944/early 1945, they had to have the bottom corners of the bustles torched off, to allow the larger hatches to open.
Looking again at their promotional montage, it may be that Dragon isn't including the high bustle turret at all on this rerelease. I hope I'm wrong, though, since the version of the low bustle turret they include will either need a lot of conversion work to plug and resurface the unwanted openings, or it will need replacement with either an Asuka styrene turret, or a resin item, which adds to the cost..