replace node from 4.x with 5 (and mixing 4.x and 5 nodes?)

[felipe]

https://pve.proxmox.com/wiki/Proxmox_VE_4.x_Cluster

with reinstall cluster node i can setup a new server and write all the configs back. is this possible to do this with 4.x to 5. or do the configs change? mixing proxmox 4 and 5 is possible at the moment?

thanx