CA/CPA = Public accountant, no?
and the transitional agreement etc are explained in the link as well. It is the most comprehensive website I've seen so far, everything you need to know about ACCA prospects can be found there or in the links provided there

It covers all that should be known for a current CPA holders, ACCA students, potential ACCA students, etc, so please scroll and read
(btw, the aim for singaporeqp is to train public accountant in the first place. No interest in being CPA/CA and you don't even need to care about any transitional agreement altogether)