Sailfins and commons have alot of differences even at a smaller size. Sailfins have round spots on their belly. Look at picture 1,3,7,10 and 11. These are good pictures of baby sailfins
To OP judging from the second picture with the wavy pattern on the belly, I going to a say it's a Pterygoplichthysdisjunctivus , still a common but not a L023 which has a broken-like circle pattern
