here is the one that is a carp - tench mix, apologies for the poor photos they really do not do the fish justice.

carp tench mix (for ease i'll call him fish A) and top tail section of the other fish of an unknown mix, (for ease i'll call him fish B)

tail section of fish B

fish a at the top of this pic and fish B at the bottom.

fish B is very strange he has a tail similar to that of a comet but there were no comets in the pond at the time. He has also remained very small even though he was in a very large tank for a good amount of time. I would suspect he was possible tench plus shubunkin .