I was operating under the impression that MPH did not apply PPLNS as it would be an oxymoron for a pool specifically featuring multi-algo, multi-coin switching.  That is the only reason the majority of us use MPH.  So...

Is PPLNS applied when switching among coins of the same algo on the 17xxx ports?

Is PPLNS applied when switching among algos on the 12xxx ports?

Need specifics here, not speculation.