Number of requests = numbers of user

I have a question and I appreciate any help.

To make long story short Days ago in a meeting with a qa we talk about the differences between # request and # of users in a case.

I think is different but depends of the case, when I used a service o something like that it doesn't matter, because 1 user perform 10 request in one minute is the same than 10 user perform each 1 request in the same time

But For example if I need to validate the service's throughput send 1000 request in 1 hour, does it matters if I send 1000 request but not from 1000 users in 1 hour?

I want to know other perspective and know other opinions

Thanks in advance for any help

Sorry in advance for the english