Really need to get sized up to see what is best for me.
I always assumed the two bikes I ride were identical. I can never really feel the difference.
The seat post of course is raised or lowered to suit my legs but the rest of it you can’t change much.
I have 170mm cranks on my Trek and 172.5mm on the Fondriest.

Here are the frame sizes as measured this morning.
Trek

Fondriest