I've checked the OOB file and the differences between B2 ("Rogatka") and B3 T-72 variants.
My ideas:
-Both tanks should have same FC as they both use same FCS - Sosna-U.
-Rogatka should definitely have stronger reactive armor than B3, as it uses third generation Relikt instead of the Kontakt-5 on B3.
- Regarding the EW, Shtora-1 on Rogatka is correctly represented by the VIRSS, but i think that the B3 should have EW removed altogether. Some webs claim that there's Shtora-1 or even ARENA-E installed, but photos of fielded Russian tanks don't have any of these components installed (missing radar, missing IR sensors, missing laser sensors).
T-72B3 walkaround:
http://btvt.narod.ru/5/t72b3m/t72b3m.htm