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PaulThe R314C set with DiMaggio and Feller is definitely from 1937 since it includes Doerr. The OPC set was a Canadian issue and presumably sold only in Canada. I would consider the OPC to be Feller's rookie since it is a true card and from the same year as the R314C.
Many great players are missing from the Play Ball sets, including Grove, Mize, Lombardi, Hartnett, Billy Herman, Dizzy Dean, and plenty of others that I'm not thinking of off the top of my head. No one seems to know why. Maybe contractual issues.