Sat6 Activation Keys - One or one per RHEL version?

Hey all. I am trying to figure out if I need an activation key per RHEL version, for example one key for RHEL 5, one for RHEL6, etc.

Currently I have on key and have all three RHEL versions product content enabled. This is a replication of how we have our activation key set in Satellite 5.

However, when I view a host's product content I see that it shows it gets content for each RHEL version.

For example, a host that I have registered is RHEL 6, but the product content tab shows
RHEL 5 Server
RHEL 6 Server
RHEL 7 Server
And all the other child channels that I selected to Yes.

Is this causing any issue and should I have an activation key per RHEL version?