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Hi, here's what I believe might be going on.
The PS4S has really square shoulders and gives the tyres a bit more of a "meaty" stance compared to many other regular tyres. I remember getting them fitted to my 3 series and thinking how the wheels seemed to fit the arches better, especially on the rear.
I haven't checked but I think that the PS5 is most likely the successor to the PS4, therefore more of a general high performance tyre instead of the PS4S Ultra HP spec where the sidewalls will more square for high speed cornering stability or grip. If it's 225 on both tyres the general road contact patch shouldn't be different to any significance.
If you have been happy with the PS5 on the front (if I were you) I'd go for PS5 on the back as well.
Hope this helps!
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