The short answer is "yes," all things being equal.
Buffing is a preparatory step in the lacquer-finishing process when handled by the factory or the traditional re-finishing specialty shop.
If the originally unlacquered horn were refinished using the traditional approaches, it would be buffed at least as much as a horn destined for a lacquer coat (or even a plated surface). Horns coming out the factory have been buffed extensively as well, but the engraving and perhaps final tonehole milling/leveling are downstream.
Buffing machines are/were the quickest way to get a mirror finish with no perceived irregularities or blemishes.
If the horn you are interested in was (re)lacquered by someone who simply hand-polished to obtain a reasonably clean (not necessarily mirror-clean) surface, it will have experienced much less metal loss.
Any re-finished horn has lost value to collectors or those wishing to flip for a profit, but likely will play/sound as nice as it ever did; the only serious structural risk is that the buffing wheel would be allowed to eat away at the tonehole edges. If you get a refinished horn that has lots of tonehole warpage, that could be why.....