They sound similar but the full version handles volume and pumps better. The SE version, because it uses less CPU cycles, allows you to add more instances to your tracks.
Not a huge difference about 30% better overall for the full version.
The real show on the card is the Pultec, Cambridge, Fairchild and the LA2A. Except for the Fairchild the others are like water to a river; they become mandatory parts of getting a pro sound. The Fairchild is not universally used but where you need it, it is just stunning.