The both belong the the carp family so yes. Both are cold water fish.
Koi is a type of fish. Just don't put koi in the pond and it will not be a koi pond.
Koi
koi fish would normally eat goldfish food try tetra fin goldfish flakes they are made for goldfish and koi
Koi have barbels on their bottom lips (whisker-like projections) and goldfish do not
I think it's KOI I have a friend who's is a really big koi lover. He is very adamant about the fact that koi are not goldfish!
They get along with goldfish but you'll end up with babies that are part goldfish. I have them in the same pond and that's what happened to me. The main problem with putting Koi with other fish, is sometimes the other fish like to eat Koi.
If the Koi is large enough it may well eat a goldfish fry but Goldfish and Koi are not fighting type fish so they do not normally bite one another.
Goldfish do not have hair; instead, they have scales that cover their bodies which can vary in type and colour depending on which type of goldfish you have.
Koi, Japanese goldfish from the carp family, mate like most other fish. The female Koi lays thousands of eggs which are then fertilized by one or more males.
No they are not goldfish
The Chinese developed the goldfish. Koi were developed in Japan. So the answer is no.
There is a variety of goldfish from fantails, ryukins, moors, ribbontail, veiltail, orandas, bubbleeye, telescope, common, koi, comets, just to name a few.