I've googled that difference too bigbuttons! My understanding is that with the deadlift squat, your upper body is hinged forward from the hips whereas the upper body is upright with the sumo squat. I think with both (but for sure the deadlift one), you have to push hips back and up.
Perhaps Caroline girvan should do a video showing all her main moves with tips and instructions. I would find it so helpful to have all the at in one place.
Did you do day 43 today? I didn't enjoy that one at all. Too many sumo deadlifts. The hip thrusts made me glutes hurt though.
Well done for re-doing it!!!!