Only if they are identical and you physically link the rotors together, once you know they are at the same rotor position.
It's been asked a few times before, some of them here
https://endless-sphere.com/forums/search.php?keywords=parallel*+motor*&terms=all&author=&sc=1&sf=titleonly&sk=t&sd=d&sr=topics&st=0&ch=300&t=0&submit=Search
and there's others a more determined search will find.