-
Depends on the bike of corks.
My TT bike has shorter cranks to open hip angle because I have crushed my leg blood tubes or something. If I adjusted the TT bike as per my road cranks, plus the difference, I wouldn't get so much hip angle opening. So you can adjust a little bit but if you're just trying to replicate between two bikes of roughly the same purpose I'd try and get them equalised.
Is there any literature from a bike fitter discussing what one should do with varying crank lengths between bikes and maintaining as close as possible a fit between them as possible? I've always thought saddle height should be adjusted by the difference in crank length, to maintain same leg extension, but I've never been sure. Is angle at the top of the stroke more important?