No. These schooling shows aren’t super common in my area, but they’re out there. However they only offer E and A level. So training and first level, basically. Whereas in the US the schooling shows may include medium/upper levels.
The schooling shows here are good if you want to get your feet wet and learn a bit about competition without yet investing in passing your Abzeichen, registering your horse has a competition horse with the FN, and other associated costs. The actual cost of the classes between schooling shows ans recognized isn’t significant. They’re often about the same.
You cannot use these schooling shows to establish your levels for accredited shows…that I know of (never crossed my mind). You still have to complete the reitabzeichen. If you have a competition record from the USEF or BD that shows your scores in recognized shows, the FN will let you use that in place of the reitabzeichen. For example if I came with a record from the USEF with adequate scores at recognized competition they gave me permission to ride L level, after 3 good scores at L, I was then able to get my M/S card.
For getting your reitabzeichen you can use your own horse but I often see local stables/riding schools advertising courses where you can borrow a school horse to complete the course. Which is handy for people like me with a great dressage horse…but jumping isn’t his forté