I don't think I've ever seen an R10 but according to some Chevy and Ford forums, R10 is a lighter duty version of the R11 and maybe a slightly different case. Used on some of their lighter cars. If so, I expect it works out the same as the R9 and R9A (or R9-1) as to interchangeability.
I remember a forum post that said Packard and Stude actually used a later version than R11. May be true as case and lockout switch different on 48-50, 51-4 and again on 55-6. Still looking for a good interchange and OD book that would have the answer.
Did you happen to see the R10? Just curious how it compares to the R11 used 48-50 and the later units. The lockout switch is the big difference I think. Early 11 has switch in cabin, then 51-4 has switch on OD unit and 55-6 has none at all and is the one suspected of being the later version.
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