info_player_start and Shadow Klainer can also appear in other maps, the curse detector can be spwaned in other maps, ARC does have bases in other maps but these ones are not the same has the ones in gm_construct 13 beta, you can check the full list in the main page of the wiki.

The reason why I ask is because I never seen anything cross over. No shadow klieners, no sempers, no info_player_starts, not even mingebags! I even purposefully broke the mingeseal to bring them in, and yet, nothing.

Also the wiki isn't really the best place to find stuff. Sure It has a lot of stuff, but some of it isn't really that helpful.