Absolutely divergent.
Game production ramp up at ~10 times real speed.
I got something like ~5000 H6K flying boats by November 1941 - but in history Japanese made only 215 (of them ~100 in June-November 1941).
The effects of course of war was different, but not by factor of 50 (rather by factor of 5 i guess)
Game AI very ineffectively put equipment in service though. As result, AI rapidly encountering "over-storage" and limit his own production to realistic levels.
Therefore, human player have a huge advantage of hyper-production.