The reason Fallout canon is so confusing is because it makes no damn bit of sense. Bethesda owns the franchise and has an established official canon, but it makes no sense.
*Some things you would expect to be canon, like the Fallout Bible, Official Game Guides, and Fallout:BoS are completely non-canon
*Some things you would expect to be non-canon are canon, such as the comics
*Fallout, Fallout 2, Fallout 3, and Fallout: New Vegas are all equally canon, despite the many contradictions
*Fallout: Tactics is canon in all places it does not contradict other canon works.
So technically, T-51b would be stronger than APA in DC, but weaker everywhere else. Obviously, this is illogical and makes no damned since whatsoever.