There was no Russian tank assault in the 1992-1993 Abkhazia war. The separatists were however in possession of some tanks (possibly T-72, T-80) secretly supplied by Russia. Detailed information on this is hard to find.
As for the 2008 South Ossetia war. Georgia fielded equal and slightly more advanced tanks (T-72B, T-72 SIM-1) than Russia had available in the north Caucasus. This did however not determine the outcome as the tanks did not clash. Most of the losses were to RPG's or abandoned for different reasons.