Questions on multiple ENS for the same wallet address

Hello – new to ENS and I am excited to share that I acquired my first ENS domains, but did have some questions. For the purposes of this post, let's use 'sample1.eth' and 'sample2.loopring.eth'. I have both of these, and they are set up on the same wallet address.

1. Can someone explain the purpose of 'Primary ENS Name' for the ENS Domain, or share documentation? When I acquired the .eth, I selected that as the primary.
2. Both are set up with the same wallet address, and wanted to confirm prior to sending tests. If I send to 'sample1.eth' or 'sample2.loopring.eth' they will both receive to the same address right?