oh it wouldn't surprise me one bit that the same poster printers print theatrical and commercial posters for different clients
that's the nature of the printing business
but still, that Gremlins poster does have Japan info on it. the Aliens poster has no such text. That doesn't mean it may not be Japanese, or if it's a poster only for the Japanese market, that it may not have been printed here and shipped there.
I certainly can't find how I could consider it a Japanese teaser poster and if someone submitted it to me as such, I would have sought more "expert testimony" so to speak, so I could know that I am really selling what I say I'm selling