Originally Posted by
corrado33
Do both wheels spin freely? If yes, this "problem" of yours is in your head.
Seems that way. Everything else appears to be ruled out.
Fit and posture on the 2 bikes can be different, which gives a different feel.
OP says he's using equivalent gears, so without knowing the specific chainring-cog combinations and wheel size, have to assume they are the same. But a small difference in gears can be a big difference in feel.