Ah, fair. I mean, if one really wanted to one could tie oneself in knots justifying the uniform difference, but I don't see any reason to. That's still eight years.Monster maroon uniforms were in use by 2278. Pretty much putting that as the last possible year TMP could have taken place.
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(Personally, in My Star Trek Universe 1,000 Stardates is a year, and by that metric there's only a year and a half between "Turnabout" and TMP. Which has its own problems both logically and with dialogue, so I don't advocate for it. But I personally don't need there to have been most of a decade there. I'm just observing that there could be.)