That’s correct. Basically same stuff. Takes a little technique and expertise to spray as it is about as thick as water and runs easily.
I’ve been using Behr sealer on Poly boards for years. I do not use it to hide burn throughs. For burn throughs as mentioned a little styrene rubbed in or even a little catylized resin followed by a touch up sand. I wipe on the Behr very thin ising a soft lint free cloth. I don’t want to have any build up. Just a wet looking surface after I apply. I will do up to 4 coats this way. Also because I lay it on real thin I don’t have to do much with it after. Its really just a final sealer so the board stays clean looking and so it has a little more UV protection.