That Viper 8GB ram kit is on the supported list for the ASRock B450M Pro4 that I have and it is supported to 2933MHZ. I did notice that last week and was thinking of going with that kit and selling my current G.Skill kit.
Yeah, i think selling the memory is easier ? even if it's supported it may not work at 3200 it depend on the cpu silicon and the mem chip. There is a youtuber he had hynix or micron memory he said it didn't work at all with Ryzen at it's rated speed, he had alot of motherboards BTW.
Yeah getting new ram would be the easiest route. I just tried swapping my modules to run in the other 2 slots and still I can only run it at 2400MHZ dual channel mode.