The Leopard 2 tanks introduced by West Germany during the 1980’s were the first of the new generation of main battle tanks. The Soviets did not have anything to match this tank and had to rely on sheer weight of numbers in their battle plans until they could copy the reactive armour and other technological advantages.
It is difficult, but not impossible, to balance scenarios with such mis-matched technology. It is made easier because the capability of Armoured Personnel Carriers, infantry and other supporting units was very similar between the two opposing armies.
Balancing such a scenario can be done by modifying the scenario requirements, introducing time limits to force the pace, reinforcing the weaker side or giving some additional planned bombardment to the weaker side.