To be clear, I own several 80-100 year old cameras and have used them with all sorts of holders old and new, some of them at least theoretically matched to the backs but many not. Somehow I've managed to make pictures I'm happy with.
How difficult it is to fix a mismatch depends on the direction of the error. If the GG is too close to the lens, it's easy to use shims to move it outward. But if it's too far, you have to do surgery on the back to bring it closer.
Good luck and have fun!
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