Depends on what resources exactly you're talking about.
1) RTP:
only in RPG-Maker engines, and only if you own both VXA and the maker you want to use it in.
all other engines are NOT allowed to use any RTP from any maker.
2) Shop DLC:
If you haven't purchased the DLC, then no.
With a purchase you get the licence agreement telling you what you can do with it, sometimes that is RM-Only (no other engines) and sometimes that is any engine.
3) Custom Resources from other games
no
unless the artist specifically gave licence to use it (and then you would be able to find that licence) you cannot use those resources as your own.
I don't know what written in license agreement of that graphics packs because tiles taken from other non-protected projects (it's old practice).
It is also illegal and can get your project a C&D requiring you to delete everything for copyright infringment.
just because it is often done doesn't make it legal to use resources without licences.
In fact as a general rule you can say:
If you don't have a written licence agreement allowing you to use something, then you can't use it at all.
