I am going to take a stab at clarifying based on my recent conversations with PG.

The additional "styles" that you can buy are simply styles using already present RealTracks (always RTs and not MIDI). So in these offerings you just get new arrangements, but not new RTs.

In the added RT offering, you do indeed get new RTs not in the current 2022 UltraPak, BUT I am told these are "sneak previews", if you will, and they will be released in the 2023 update to UltraPak, so essentially you get them early by buying the extra Pak.

I think I have that right and I hope it helps you.