Most all of the AK variants use essentially the same internal parts. Receivers do have some differences between the various models due to things like buttstock mounting methods (single tang, double tang, through bolt, etc.) however, the front stocks mount the same on nearly all models. Top (bolt) covers seen to be the same on most of them. Of course magazines will all interchange.
If you are talking about what tacticool bolt on junk, I mean accessories will work on a particular model, perhaps you should contact the manufacturer of the particular add-ons you want and ask them.