All G-series platform cars are using 5*112 PCD. The F-Series cars are the last generation that uses 5*120 PCD.
The rear are very inbound instead of a little inbound. Below is the spec comparison. Basically, the rim is 1inch narrower for the G31 which is the main factor to the inbound. ET is actually similar and I doubt the 2mm and 4mm difference are noticeable
G29. vs. G31
Front. 9Jx19 ET32 with 255/35R19 8Jx19 ET30 with 245/40R19
Rear. 10Jx19 ET40 with 275/35R19 9Jx19 ET44 with 275/35R19
As above spec says, the rears are the same size. Fronts are 10mm narrower. I doubt the comfort and noise are caused by this 10mm difference in tyre width. It's more about the tyre compound and design. PSS's performance is much better than the P-Zero 4th gen LS but it's also much harder and louder than the P-Zero.