Although add-ins used in ArcMap and ArcGIS Pro seem to be relatively similar, they do use different file extensions (i.e. ArcMap = .esriaddin and ArcGIS Pro = .esriAddInX). I'm curious if there is a workflow to import a .esriaddin file into ArcGIS Pro. After a quick test, it doesn't appear that ArcGIS Pro will recognize the .esriaddin file on its own.
