The second one doesn’t seem to be butterflied, as it would be missing a dorsal fin if it was, and the skin color is asymmetrical. They’re 2 different species imo, but I’m only familiar with Atlantic salmon so I can’t say for sure. Atlantic salmon normally look like the top one and get an upturned hook mouth but don’t really change color.
The second one doesn’t seem to be butterflied, as it would be missing a dorsal fin if it was, and the skin color is asymmetrical. They’re 2 different species imo, but I’m only familiar with Atlantic salmon so I can’t say for sure. Atlantic salmon normally look like the top one and get an upturned hook mouth but don’t really change color.