New PS4210X in a group with 2 x 4100x devices

Hiya,

We currently have a group that has 2 x PS6000x and 2 x PS4100x devices in a single pool.

We're looking to retire the two PS6000's and buy in a single device to take over the role of these two boxes.

Would we be able to purchase a PS4210x? Would this exist happily in the same group as the 2 PS4100 that we would be keeping? Or would we need to go for a PS6 series?

If there is an issue, would we be able to put it in its own group? If so, what limitations might we face?

Many thanks for any input :)

Andy