Wouldn't you have issues with drivers if the motherboards are different makes?
No - make has no bearing on it, only what chipset / audio / lan etc the motherboard has. Windows 10 is however very good these days at moving between hardware, even going from Intel->AMD or vice versa is largely problem free.
Both the 2409 and the 2602 beta will support ryzen 5000, I'd be tempted to go with the latest beta though as it has the latest agesa 220.127.116.11 which brings a lot of improvements in performance and stability.It's a Asus prime b450m -a.
Whole rig was originally a pre built until i Started tweaking.
I've been on the website and there is a bios that added a CPU support(2409) but I'm not sure what.
Oh great stuff so only the CPU needed.
Only thing is my current board hasn't been supplied with the plastic clips to attach the heatsink. (They are not needed with the 3600 heatsink.
Can anyone suggest a alternative cooler which won't need those clips or should I just order some of those to?
Does it still have the backplate that the plastic clips screw into?