[nickcarraway]

aka easy listening or middle of the road (MOR)

I don't think they are a complete overlap.

The Carpenters would be Easy Listening, but not Yacht Rock, right? What about the various Osmonds were Easy Listening, but not Yacht Rock. What about England Dan and John Ford Coley or James Taylors. Not Yacht Rock?

[a fool in paradise]

I thought the Carpenters were SPACE ROCK

https://www.youtube.com/watch?v=0JOZXXZ5qPc

[Hardastarboard]

England Dan and John Ford Coley

The mere mention of those names makes me wish I'd been born deaf.

[xp38]

Well as you said this is a new term and that is how it was labeled back in the 70s. How it is exactly defined now as Yacht Rock and what that means is up to the current music scene people. This is the first time I’ve ever heard the term.