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@Escobar is actually right, Ander isn't really a DM, that'd be Carrick in our team.
Herrera is more of a box to box who presses everywhere and also high up the pitch. You normally wouldn't see DM constantly pressing as high as the opposition goalkeeper.
Carrick is the one who sit in front of the defense, Herrera roams everywhere. The difference between him and Pogba is that the latter is tasked with the creative burden of the team and has a lot less restriction with his positional discipline and can wonder high up the pitch very often while the former in Herrera is more tasked with recycling and intercepting the ball and get our flow going. He also roams all over the pitch and press as high as the opposition's goalkeeper.
But Herrera is definite not a DM but more of a box to box with an inclination to more defensive duties.