I would think $otC in its rules bible has a clause about the "Best Answer" being the only one acceptable for a regular question. Password Plus had a similar one:
Yes, but I would argue that the "Best Answer" doctrine is not what's at issue here. In the Password Plus example, this is to say that the definitive answer and not items that coincidentally fit the same category is what will be accepted (in essence, you can't play like a Cliff Clavin and twist the answer to your benefit). The case I cite is that differing terms identifying the same individual (i.e., birth name versus stage name, the latter of which was also the name of his most memorable character), the contestant did provide an answer that matched to the same specific individual as to what was on Perry's answer card.
I suppose Sale of the Century was never as high-calibre of a trivia quiz as, say, Jeopardy!, but, hey, if your Jeopardy! answer is, "Ed Sullivan said of this actor's 1931 Broadway performance in
Nikki that this ‘young lad from England has a big future in the movies’." and contestant questions, "Who is Archibald Leach?" instead of "Who is Cary Grant?", you're not going to rule against him, are you? I doubt you'd be expecting anybody to answer his birth name either way when, technically speaking, he hadn't adopted the name "Cary Grant" at that point. Either way, you're referring to the same individual.