Chris,
For what it’s worth, I’ve never heard of ‘relative minor 7th’ used as a name for what we usually know as a 6th chord.
If you asking about, say, a C chord with notes called C, E, G, A or C, E, G, Bbb… yes, they’re both the same.
Except that musicians you work with might kill you if you use the latter!
Thanks for reading and writing,
TC

On another note, no doubt the major add2 gives that “romantic” 80s vibe, especially when played on a DX7 electric piano