Im pretty sure this is fine and a none event but just for sanitiy... does having more hosts on one site than the other matter? So if we had 5 hosts on one site and 7 on the other. It really shouldn't matter should it as the replication is based on the clusters etc? The amount of RAM is pretty much the same with unequal hosts, but would be a good way off if they had the same amount each site
As long as you have enough resource it doesn't matter to be honest, you could even run with 1-2 hosts in the remote site, but it would just mean that the recovery process would take longer probably and your VMs could be starving for resources when they get booted up.
