Snail 2 looks like a post horn snail to me, I've found them in my tank, but am not quite sure yet, if they'll eat my plants.
Snail 1 is a very common aquariumsnail, they don't get very big and I've always had them in all of my tanks. They've never attacked any of my plants, just eat algae and dead plants pieces!
Previously: 2x 10gal tank, 45gal aquascaped, 70gal aquascaped
Currently: 16gal FW, 40W CF, ADA Aquasoil Amazonia II/Tahitan Moon Sand, PH 6.5, kH2, gH 4