IMO that's looking too deep into it and drawing connections that weren't really there when it comes to matching in-game styles and box styles. Its as simple as western audiences weren't receptive to eastern art at the time, and so the standard practice was to re-do the art for almost any game. Sometimes that worked out well and sometimes it didn't.
I spoke with the artist of dragon warrior 3&4 (US covers) and he said he the language issues were huge. Given very little to go on, apart from a bit of time with technical people to whom he spoke through an interpreter (who in turn should have had an interpreter...engrish
) and a bit of in-game on a vhs tape.
These american artists had a hard job and precious little time to do it. Easy for us to pick it apart 25 years later but that's how these things were back then. The industry was still growing and globalization hadn't arrived yet. I for one think the stuff they came up with, generally speaking, was great. Yeah some are better than others but the same can be said of the japanese and european pieces too.