At a previous workplace, Charles Proxy was not in the list of approved software. I don't recall the reason - it might have been cost, but we used lots of paid tools, and since it was in the restricted category, we couldn't pick and use (we handled a copious amount of Western PII, from reading, working on it, to storing it). Two were approved: Requestly and another was a link to an internal wiki with a really "interesting" process involving Wireshark and whatnot. Needless to say, that doc was one of the most clicked and least read. I tried Charles at a later place that offered a license, and I went back to Requestly, which I really found to be more straightforward or simpler to use.

It is the same thing though?

Charles is a http proxy, Requestly judging by the landing page is a http client like Postman.

"approved use" is usually just someone that doesn't understand what the software does.

I recently had the IT team at my work ban VNC client, they didn't understand it wasn't VNC server, which I could understand being a security risk, but the client? They're idiots.