Converting from NAD 83 Ohio SP South (NAD_1983_StatePlane_Ohio_South_FIPS_3402_Feet) to WGS84 creates different outputs in ArcMap compared to ArcPro. When opened in ArcPro the file appears to be the same (it must be doing a projection on the fly), but when examining the data further, either by exporting it out as GeoJSON or opening it in QGIS, the exported WGS84 file is shifted slightly northwest by approx 3ft. The same file exported using the same process in ArcMap does not shift.
I am using Feature Class to Feature Class, and the environment settings to change the projection.
In ArcMap it the default Geographic Transformation method if nothing is selected is NAD_1927_To_NAD_1983_NADCON. Using this transformation in ArcPro does not help.
The attached files are the result of the Features to JSON tool, run in ArcMap for the ArcMap converted file, and Pro for the Pro converted file, with GeoJSON checked, and in Pro, the Project to WGS84 unchecked. The difference is dramatic.