Everything I've read says it is highly recommended to not mix anemone species. They can wage chemical warfare and do more than just damage each other. Also, sebae are aggressive and roam a lot. If it were me I'd just stick with bubble tip anemones.
If you want different color bta there’s plenty of them out there. It’s like putting a tiger and a lion together. Yeah they’re both cats but they’re not really gonna get along.