Just to broaden the perfect MBSims' reply.
At room temperature (i.e., above freezing point), both metals behave the same, because both are carbon steel, and both will pass the hydro test.
At low temperatures, however (i.e., below freezing point), plain carbon steel like A 105 is prone to brittle fracture and that's why you should use LTCS.
Giovanni S. Crisi
Sao Paulo - Brazil