Moiisty - I doubt the PAL releases had native PAL transfers for the deleted scenes. Most likely converted from the NTSC laserdisc masters to PAL - and I don’t trust Universal to do that properly. Though maybe someone with a PAL 30th Anniversary could check.
The DVD PAL deleted scenes look okay, but the frame rate for one particular deleted scene (AMITY TOWN HALL/Quint’s truck - not originally included for the first DVD release) does look choppy - as it does on the 2012 Blu-ray.