Queues with the same name in different regions are independent of each other.
No. A queue is uniquely identified by the combination of its region and name. Two queues that share the same name but exist in different regions are completely independent — they have separate message storage, separate consumers, and share no data.
When you send or receive messages, always specify the region endpoint to target the correct queue. Requests sent to the wrong region endpoint are routed to a different queue, even if the queue name is identical.