How important is a "High Performance" water pump?

Is the A/C pump the same as the cop pump? Have read on other sites (and listed cop accessories) that Mopar had listed it's own "high perf" water pump on 318/360 headed cop engines for the M-bodies due to high idle times of cops. Usually if I'm replacing a water pump I'm asking for the cop pump so am I getting an interchangeable A/C pump?