confused on these brakes

so doing a brake job on my 65 valiant/barracuda conversion. rear drum brakes from measurement are 9", ordered new shoes and new drums and new wheel cylinders. when i got them and they all matched up except the wheel cylinders. it took me weeks, but tracked down that it had the 9" shoes, 9" drums but 10" wheels cylinders. does that work? now me and my brother built this but that part he did and he has since passed away so no asking what's up. can you run the 10" wheels cylinders with the 9" brakes, drums? i bought the 9" wheel cylinders and way too small and did not line up, the shoes match up, drums match up, but wtf with the wheel cylinders. ,maybe its suppose to have 10" but does the holes for the drum/studs the same as the 9"? confused...