It will be tough to tell what will be the norm for this season and the future based on the past three games and prior seasons, but some generalities can be made.
I think we can count on OEL being the defenseman that will get the most minutes since he will be played in all different types of situations more often than not which we have seen recently. I think minutes wise they will get pretty similar offensive opportunities, but it is too soon to tell which one will get the best of those opportunities. As you noticed OEL did get the quality 5 on 3 PP time, but for the most part PHX has been switching the D-pairings and forward units up most of the time on the PP.
Another thing to consider is that OEL has been playing previously in the AHL this year, not sure if Yandle played anywhere at all. So Yandle could be still getting into game shape which would explain his low minutes at the end of a B2B on Sunday.