I'm not even sure if they can make any actual variants of this. The TNG one would require some kind of wrapped handle, and I just can't see them producing the wrapped material for it. Although the TOS tricorders did have pleather straps, so who knows. It just seems like something that wouldn't happen since it is more than just molding parts and there is the issue of what materials to use, how to keep it attached, etc.
The concept version would have to have very different electronics, it would depend on how they do the electronics package. But, if the prototype electronics are too different, not sure they would go to the trouble of creating completely different electronics. The TWOK phaser was just a matter of adding colored lights to the existing package. This might involve a completely different lighting arrangement.
It doesn't matter, I suppose. I'm just so excited to see this model even happen. A lack of variants wouldn't even be noticed in this case.