Hi,
I am on the Aerospace Systems Engineering with Pilot Studies course. The modules for the first year for the Pilot Studies and Space Tech are the same, so no worries there. You can probably change before the end of your first year if you wanted to change, but essentially, as you've already started your PPL, it helps towards the Pilot Studies because you need to do 12 hours minimum and PPL ground school in second year to pass a module. But well, seeing as your already underway with your PPL, then you may find second year boring as you will be doing topics you already know. So if you want to learn something new, go for Space Tech.
I chose Pilot Studies as i intend to become a commercial pilot, so makes more sense for me to go through that degree route.
Hope this helps,
George Newton