I wouldn't do it -- tried it about 10 years ago and an existing S. haddoni (( at that point had had it for 5 years, kept it for 15 )), and right when I added an E. quadricolor the S. haddoni started moving all over the place (( was running carbon and skimming )). At the time there were no other changes to the tank. Years later I tried this with a different S. haddoni (( this one was in my care for 1 year when I attempted this )) and an M. doreensis (( LTA )), and the exact same thing happened. To this day I will no longer mix different anemone species -- however I do mix different color morphs of the same species without issue -- with them even touching.