Man, I actually didn't find Juste to be like Alucard at all. Juste was always more angelic in appearance, while Alucard was rockin' the vampire outfit. Plus Juste was straight-up heroic, while Alucard had the angst.
and HoD is proof, Castle A and B is Normal and Inverted Castle a la SotN)
Ehhh, that's a little more debatable. The Inverted Castle was pretty much the second half of SotN with little need to go back to Dracula's Castle, right? But like the good Docta pointed out, in HoD you have to travel between Castle A and Castle B constantly to solve puzzles. What you do in one world affects the other, like shattering a breakable wall in Skeleton Cave A will also destroy a completely unbreakable wall in Skeleton Cave B. PoR followed SotN far more closely, with its latter-half paintings.
I just wish the rest of Castle B differentiated itself as differently as the Skeleton Caves, in which both A and B had completely different level designs. Oh wellllll
Fun Factoid:
One of Kojima's original sketches for Chronicles Simon has him looking very much like a proto-typical Juste.
Speaking of which...
Juste was originally conceived as having brown hair.