In music|lang=en terms the difference between remix and remaster
is that
remix is (music) a piece of music formed by combining existing pieces of music together, possibly including various other cosmetic changes while
remaster is (music) to produce a new version of a recording by remixing the original master recordings.
As verbs the difference between remix and remaster
is that
remix is (music|intransitive) to create a remix while
remaster is (music) to produce a new version of a recording by remixing the original master recordings.
As a noun remix
is (music) a rearrangement of an older piece of music, possibly including various cosmetic changes.