Oh you may be right, I was thinking you meant the marble pim x tsn hybrids. It may be the lei x tsn. Hard to say, these hybrids are hard to pick out sometimes
This second one looks like a standard Leiarius marmoratus.
The OP one I've never seen, it indeed looks like a hybrid to me of a Pimelodus sp. and a TSN sp. I'd definitely post on PCF (Planet Catfish) to confirm though and to get ideas, if this is indeed a hybrid, on what its parents might be.