...but 5N is still that miner (wallet address, not device), being in the pool for 5 block finds.
5N and 5 blocks are only interchangeable terms if the average of 5 blocks is 100% of expected.
If our average is 105% of expected, then 5N will be less than 5 blocks; if our average is 51% of expected, then 5N will be more than 9 blocks.