No they aren't. Infesters =/= Defilers. The faux queen you get in SC2 is not the same spawn broodlings/ensnare queen you get in SC1.
Have to say that I love the new Terran Thor units. They're my favourite. You hit a base with a dozen or so of those with the regenerating armour upgrade and a bunch of SCVs in tow and your opponent is fucked.