The pagination should be the same endpoint with a cursor argument attached to it. I’m not sure why you’d get a 404 from it, but if you have an example URL where it’s returning that response can you attach it here (the issue ID isnt sensitive).
Are you sure you’re using the headers correctly? The Link header has a ‘next’ page result, which worked for me. It’s also possible that there’s a permission error here, and I can always investigate that more.