Hi,
either of the two power adaptors avail in the UK can be used with the Doorbell PRO (no PRO Power Kit required). Not sure why there is a AC /DC difference, but I found this thread…
https://en-uk.ring.com/collections/accessories/products/plug-in-adapter-for-ring-video-doorbell-pro
The second model is a new model that can be used with all the Doorbells.