The 2nd picture is a Mesotriton alpestris ssp. You can tell it's an alpine newt because where the orange of it's belly meets the dark color of it's back you can see a bit of blue with spots, that is a definite sign of an alpine. My best guess would be M.a.apuanus or M.a.alpestris because they're more commonly kept by hobbiests. You can get a better ID with a belly shot of the animal. The one in the pic is either an adult female or a large juvenile.

Do you keep both newts in the same tank?