Around 1989, Atari starting selling the Mitac Paragon 286VE and re-branding them as the Atari PC4. As far as I know this only occurred in the German market which was one of only a few places where the Atari PC’s sold fairly well. I’ve only ever seen one example of this re-branding which can be found in a collection here on Stellios Old Computers, so they appear to be quite rare.
Specifications wise they were comparable to the original Atari PC4 but that’s where the comparison ends. It appears this move towards Atari selling generic IBM PC clones, as opposed to the Atari designed and built PC’s, was the beginning of the end of the Atari PC line and a sign of things to come with the Atari ABC series released the following year in 1990.