How to subscribe for "Red Hat Developer Subscription for Individuals" for multiple generic/rhel8 VBox ?

Hello,
after having registered a "generic/rhel8" virtual box under vagrant, and subscribed it by "attach --auto", I need to set up another one, in agreement with the developer account.
If I want to attach a subscription explicitly (i.e. --pool ) to the latter machine, for the "Red Hat Developer Subscription for Individuals" should I use the same pool_ID of the former's subscription?

In facts, I also have a "Red Hat Beta Access " subscription, which I do not actually use,
and when I look for a suitable pool_ID from the above new "generic/rhel8"-based vagrant machine, by doing:

"% subscription-manager list --available"

, I always get the subscription for "Red Hat Beta Access " while I think I need a subscription for "Red Hat Developer Subscription for Individuals".

I tried to attach the second "generic/rhel8"-based vagrant machine the same pool_ID of the first and it seems to work.

However I would ask you if there is a more proper manner to obtain and attach a new "Red Hat Developer Subscription for Individuals" to the new machine.

Thanks