- That is a dangerous assumption. At the least, you need to consider the reality that each power meter has a power data tolerance, and if the two are stacked in opposite directions from the “real” number, that could be a notable portion of the difference. Until you do testing to compare the two, you must keep that in mind as one variable in the discussion.
To your main question, it’s all but impossible to evaluate this without more details, to include pictures and/or video of you riding both bikes. Essentially, it’s best to consult with a bike fitter so they can evaluate your fit on each bike.