Unlike the work that was done to migrate SearchSatisfaction schema from legacy to modern, migrating MobileWikiAppiOSEditHistoryCompare will require creating a new schema (and then stream) in schemas/event/secondary.
It should reference the core identifiers fragment and list device_id and session_id in required, which are filled-in by EPC library. It will have an action enum, a primary_language string, and an is_anon boolean which are filled-in by instrumentation.
Proposed schema name: /analytics/mobile_app/ios/edit_history_compare
Proposed stream name: ios.edit_history_compare