Sumo deadlifts: Wide legged stance favored by power lifters. Torso is more upright and the bar travels a shorter overall distance, so that helps your back and helps from having to lift something heavy extra high. Those are the 300lb ones.
Deadlifts: generally feet under shoulders. Those are the 300lb ones.
Sumo deadlift high pulls: Sumo deadlift stance (wide leg, upright torso), and using the hips to lift the weight you also propel it high enough to go from shin to chin.
Whether you do that with a kb or a barbell is immaterial. But if you can do that with 300lbs . . . your regular sumo deadlift must be in the stratosphere . .
I, however, loathe doing them with a barbell, but only think they suck like everything else with a kb, since I like the fact the kb is between my feet: feels much more comfortable. (I probably do the sdhps with a barbell wrong, and probably try and stand up to fast cranking my back, which is part of the reason I’d wager).