I had 2 pair, different species in my 90 bow front. The Ocellaris pair were established in the tank. I bought a pair of pink anemone clowns and did not have an issue.
The Ocellaris stayed in their area, left side of tank. The pinks stayed with their nem on the right side. I never witnessed any issues with them.
I would imagine if your tank is big enough, you would be ok. I'm sure others have more experience than I do. My LFS
said it could be done. I trust them. They have held me back from buying things that wouldn't coexist, so I know they are not just trying to sell me!