To warrant success you need to be sure the glass is the same type, and form, and even then any shims would need to be custom fitted.
The lowest risk is to pick two lens made in the same year.
The optics in a lens are not like specs their peripherys are coaxial and concentric to very high tolerances.
The pre war Zeiss lenses needed high tolerance mounting. They were statement lenses designed to bury the upstart Leitz
Unless you want a really difficult project I'd suggest finding another lens with perfect optics, and poor mechanical cusmetics, they are not that expensive.
For the last 13 months I've only used a Kiev (or Contax), apart from folders, Fed's, Zorki's, M2, etc.,... and a digital to record dismantle sequences...