On the coloration of your Zebras... the males have a silver tone to
them while females have a golden tone between the black lines. You will
notice as they get larger, the females will become increasingly
aggressive towards the males and they will become more gold in color
and very wide. Sometimes they can be double the size of the males. A
larger group will cut down on the aggression.

On your leopards, there is a gold variety, a regular variety and a blue
variety. There is also a long finned variety, just like in Zebras. If
your fish are more gold then silver, you probably have gold leopard
danios.

Leopards (brachydanio frankei) and Zebras (brachydanio rerio) are two
different species, so they will not breed. Although, I am sure there
are hybrids; they will be more likely to breed with their own species
first. Golden zebra danios, long finned golden zebras, long finned
zebras, and short finned zebras, can all breed together since they are
the same species... just different fancy strains created from specific
breeding. Same goes for the leopard color varieties and tails listed in
the second paragraph.