It indeed is. And not to sound perverted here, but her chest is also a bit larger now.
Also, as Equestria Girls shows, her horn is now slightly longer than Rarity's.
Obviously, Twilight's physique is gradually becoming the same type as Cadence's.
This actually makes sense; if you compare the physique Cadence had in Twilight's flashback to the physique Cadence has now, and consider the time that passed in between the flashback's era and when Twilight met Cadence again, you'll see many differences.