Yes, they are different units, but they depict the SS-units in Eastern Front, and the Obersoldaten in Western Front. At least their uniforms tells us this.
Oh, you meant just the models. Then yeah, Panzergrenadiers and Obersoldaten are Waffen-SS. I don't remember what Stormtroopers and Jäger's look. Obers are also called "waffen" in the game's files, a bit less subtle than before.
Stormptroopers need to be given ober kar98s over gren ones.
I'd like this actually, and the Panzergrenadier G43. Then they're actually somewhat unique instead of just a modestly more durable Gren that can upgrade to Panzergren. I think the G43 needs something to go with it though to make it more appealing, even if the package just gives 4 of them instead of the usual 2. It's still competing with Panzergrenadier package after all.