The original summoner class is banned in Pathfinder Society. As per Additional Resources:
As of 4/27/15 the summoner class in this book is no longer legal for play. A summoner character that has played at least once at level 2 or higher by this date qualfies to continue using this version of the class. Otherwise, only the summoner in Pathfinder RPG Pathfinder Unchained is legal for play.
The feat Evolved Familiar and the Primal Companion Hunter archetype are both legal, and both allow you to choose eidolon evolutions.
Nothing in the Additional Resources, Campaign Clarifications, or relevant FAQs say anything about these resources using unchained evolutions rather than original evolutions.
Is there something I'm missing somewhere that says that options similar to these have to use the unchained summoner options for PFS?