I need some help on this from the shermaholics here.

The last few weeks smoke mortars have been troubling my mind and I can't find the answer.
I thought that 75mm turrets had the smoke mortar hole when they also had the loaders hatch.
This seems to be confirmed here: http://the.shadock.free.fr/sherman_minutia/turret_types/75mm_turrets.html
But looking in Hunnicut yesterday I found at least two pictures of 75mm turrets without loaders hatch but with a smoke mortar hole. Same goes for Tasca manuals on the M4A1, 2 and 4 where they state to open the smoke mortar hole. I was under the impression that Tasca normally does their research.
Same goes for the Dragon M4 Normandy which has the hole open.., I also think Hurricane has the hole open, but not sure here.
I'm building a Sherman of 70TD on Utah, reason why I started looking in on this, but now I'd like to know it for my other Sherman's.
I'm getting clueless here...

Any help on other small things on different Sherman versions would also be appreciated, I'm thinking on things like brackets, spotlight, etc.
Many thanks!
Dave