I dunno, that one on the left seems to be a bit more orange than red. That one could be a regular comet, but the one on the right definitely looks like a sarasa. The sarasas will have a distinctive red to them that just seems to get more intense as they get older, and they'll stand out from the orange of the comets.
Regarding tail length... that's just a feature of comets in general. I have common comets with really long tails, and I have sarasas with the regular short tail. I always try to pick out fish with longer tails because I like them better when the fish gets larger, however since people have helpfully given me fish over the years, I now have a variety.
Really it doesn't matter much what kind of fish they are, they're both very nice looking and will be happy growing up together. And they'll even breed with each other if you have a pair.
Regarding tail length... that's just a feature of comets in general. I have common comets with really long tails, and I have sarasas with the regular short tail. I always try to pick out fish with longer tails because I like them better when the fish gets larger, however since people have helpfully given me fish over the years, I now have a variety.
Really it doesn't matter much what kind of fish they are, they're both very nice looking and will be happy growing up together. And they'll even breed with each other if you have a pair.