Adding a different colored parakeet to the same cage?

I know that my parakeet gets lonely during the day when I’m gone because as soon as I get home she chirps madly until I pet her. I wanted to get another parakeet, not just for her company, but because I love birds. Does it really matter what color the parakeet is? I know they are different breeds, but is it life threatening to my parakeet? She’s all white except for a patch of blue on her back.