Okay, neither of these are very good. They both followed the stolen-identity-sinister butler/manservant formula I saw in The New Sonia Wayward. What's up with that? Why the repetition of the same theme... I was bored. Too bad.
Well, Carson's Conspiracy was not really stolen identity, but about a man who has the brilliant idea of faking his death to escape pecuniary problems. But sort of stolen identity, since he has an employee travelling under his son's name to do it. Enough of that. The Gay Phoenix is about two brothers on a boat, one dies and the other assumes his identity for the money.
That's all you need to know about them. No need to read them, really.