I'm currently using LTMs from running auto-calc on a 1974 replay league in a alternative history league in the same year. I don't expect the results to match historic because the talent is different. I expect differences to be plausible.
For example, scoring is down a bit. That's plausibly realistic. I'm running historic minors. As of a year ago (game time) 22% of the league's SPs and 41% of the RPs were career minor leaguers. Those percentages probably still apply a year later. That means those career minor leaguers are rated higher than the pitchers who historically had those jobs. So the league has better pitching than historical and lower scoring should be expected.
I happen to think OOTP is rating career minor league pitchers too high but that's not the issue here. The point is they're in my league and affecting its output as a change in talent should.
Here's the thread on pitchers if you're interested.
https://forums.ootpdevelopments.com/...d.php?t=360806