what is the difference between system and acceptance testing as a tester? what extra test cases will acceptance testing produce?

I read some of the previous answers of similar questions on here but i am not satisfied. So both System and acceptance testing evaluates the system against the requirements. System testing is broader and includes things like documentation testing, perfomance testing, load testing, compatibility testing and things an end user wouldnt normally test when they seek to accept or decline the system.

Acceptence testing is for the users and they decide if they will accept the system. But acceptance testing is allso for us testers... here i am abit confused of what extra test cases i will produce in the acceptance-phase that i did not already produce in the system phase?