I can't give you a full answer, but I will give some military/divisional statistics I wrote down a while ago for a project I was working on. One of the limitations, however, is that I've never used easter/russian sources, so all my numbers are actually estimates created by the western powers and NATO of Soviet and Warsaw strength and not necessarily accurate. Though I have heard (anecdoctally, please forgive) that in the 70s/80s, when the east and west were negotiating arms reductions, the Warsaw Pact was in some cases so bad at estimating its own military, that the WP negotiators would sometimes rely on NATO estimates of their own forces!

Anyways, as a precursor to NATO vs Warsaw Pact, let's start with a baseline in December 1948, before either alliance was created:

USSR - 175 Divisions, 14k aircraft

vs

The West - 25 divisions, 2k aircraft

D-Day+30 - 90 divisions, 6k aircraft

numbers from Unilion Progress Report, Unilion being the Western Union Defense Organization's Command HQ

These number were further studied by SHAPE in 1950/1951, and found that NATO actually had about 15 "ready" divisions, and 50 "reserve" ones ready for combat. This is still before the Warsaw Treaty Organization, or Warsaw Pact, comes into being.

In 1952 (again before WP), the accession of Greece/Turkey added some active divisions, with an estimate of 80 total NATO divisions in various stages of readiness.

In 1955, with Germany joining NATO, the WP is established, arguably in response to this accession. At this point, the Soviet Union counted 175 divisions, with 125-145 extra on D+30. About 20 Soviet and 60 "satellite" division were stationed in eastern europe, in addition to about 20k planes.

In 1958, NATO counted 35 active, ready divisions. I've been having trouble finding an accurate count of reserve/M+30 divisions, as the concept changes to using tactical nuclear weapons, integrated into infantry commands. The 175 divisions of the Soviets remained the same, and a modest increase to 61 divisions for the rest of the WTO.

One thing to remember as well, is that divisions can vary in how "full" or "ready" they are, and the value of having modern equipment, training and support available to a division.