Unfortunately, you can't use old Nest Wifi points with Nest Wifi Pro.
Sorry. On the positive side, you will have access to the new 6 GHz band.
https://kb.netgear.com/29396/What-is-the-difference-between-2-4-GHz-5-GHz-and-6-GHz-wireless-frequencies
I was having the same problem with Nest wifi points going offline
randomly. I finally upgraded to Nest Wifi Pro, which has solved all my
wifi problems. The speed is twice as fast, and I've had no connection
issues since I installed it (about a month ...