Afghanistan has a population of 30 million.
Georgia has a population of 4 million.
The odds are in Moscow's favor.
That, and the Georgians are more civilized, probably don’t like fighting as much as the Afghans, and will likely first try negotiating or bribing the Russians to leave.
The Russians were defeated in Afghanistan by tactics, not merely by being outnumbered. That said, this is likely to be a more standard military conflict. The problem for Russia is that they are clearly in violation of Georgia’s sovereignty, so I don’t know how that’s going to fly.
Georgias Army is technologically some centuries more advanced than the Mujahedin in Afghanistan were. However I doubt that the Georgians have the zeal of the Afghans... and probably no “big brother” like Saudi Arabia/Pakistan and the US were to the Afghans. I hope we don’t let our Georgian allies hang out to dry. Here is hoping that the Georgians shoot down more Russian planes and throw them out.