I’d use the remix EP release group since it’s titled the same and has the same cover art.
I will also suggest you give a quick read to the style guide for remixes - quick summary, remixers do not belong in the artist field, and the remix ETI needs to be in parentheses. Spotify in particular is notorious for messing with track titles!
Here’s a pretty good example of a remix release with proper credits - I Am Legion (remixes)
you could also go with the secret third option, a new release group (tho I don’t know that it makes sense in this specific case, since it’s not only the remix + original albums)