Yes they are different variations/varieties of the same species.
Yes. Sarasa Comets is just a fancy term for red and white comet Goldfish. Same species.
Sure
No they are not goldfish
They are Goldfish and so they mature and breed as goldfish. They can be sexually mature at 1 year if they have been well housed and well looked after.
Yes, they do quite well together, I have both Comets and Shubunkin in a pond and they are very happy.
Sarasa are usually white with bright red markings
Yes, goldfish can breed in the home aquarium.
Usually Goldfish breed spring and early summer
In late spring of early summer is the best time to breed goldfish.
Yes they can cross breed.
my house
Well, they have to be mature also, which is about a few years of age.
No. A goldfish can only breed with other Carassiusspecies.
Spring