Is there a need to compensate? If you shoot mono, then darkroom work will enable all the contrast control you could wish for. Tho I have no idea at all, I would suspect that whatever the differences between the rigid and collapsible, they would be swamped at the printing stage (perhaps apart from resolution, but even then, with a triX/Hp5 film hshot handheld, I bet this would diappear totally too).

A light yellow filter on all lenses would slightly increase contrast and deepen skies a touch (as well as protect them) but it would seem strange to want to use a different filter on different lenses to match contrast. I think there are far bigger issues to worry about! Sounds like you got a bargain!