I have around 100 EAPs, mainly 245 and some 225 but i have some 330 as well. because of that i am running an old controller software, to support the 330s.

i physically moved all 330 to a single site, so i can use old controller software on that site. all 3 sites are connected via vpn but have different subnets. i have my controller in my datacenter (fourth site i guess) and it works fine. can i install the old controller software on the 330-site and upgrade my controller software in my datacenter to a newer version (i really need the functionalities of the newer controller software but need the old version afaik to manage my 330s)

is there a problem in running multiple controllers in different /24 nets? OR is there a problem to upgrade my controller software in my datacenter to newer version? will i loose support and manageability for my 330s?