Navigating SFT changes

I want to make sure I've understood this correctly.

Scenario 1: You 'retire' from a position with an OPS at 50. You want to continue to work elsewhere, say on a part-time basis, topping up your income from your OPS/ARF. No problem.

Scenario 2: Same as above, but you had a PRSA instead. In this case, you can't work, is that correct?