Quote Originally Posted by Rydiro View Post
I wasn't sure if there were relevant differences between light and gravity waves which would result in different properties of the black hole. Anyway, i got factotums answer.
No-hair theorem. The only relevant traits of a black hole are mass, angular momentum, and charge. (Where sufficiently large amounts of energy in whatever form are treated as their mass equivalent.)

Once the event horizon is up, you can't really tell if the black hole you're looking at is primordial, a stellar remnant, a kugelblitz, or came from God deciding to play Rube Goldberg with gravitational waves.