I'm using the older Samsung 25w travel plug along with a 2m long anker USB 2 cable and I'm still getting super fast charging option.
Anker USB-C to USB-C Cable, 643 Cable 100W 6ft, USB 2.0 Type C Charging Cable Fast Charge for MacBook Pro 2020, iPad Pro 2020, iPad Air 4, iPad Mini 6, Galaxy S21, Pixel, Switch (Daffodil Yellow)
https://amzn.eu/d/1wLGcDOHaven't noticed any slow done in my charging after the update, both on mains or in the car.
Never tried the 45w charger as the speed difference wasn't worth the purchase to me.