I asked a question about this exact topic on Information Security over 4 years ago, which received very little attention but the one answer it received came to the same general conclusion (possibility of protocol differences):

https://security.stackexchange.com/q/91717/78662

However, if these are hosted on the same server, there is a long-standing bug in Apache that forces the same protocol and cipher suite for all virtual hosts:

https://serverfault.com/a/698478/293818