where are synced pictures kept on my MAC.

[iMore Question]

If they are in the library in photos, how do I know which ones are iPhone and which are others? There is nothing called Library in photos, so I assume you mean " all photos.

How are they identified differently?

 

[kch50428]

How are they identified differently?

They're not.

 

[kch50428]

Mac Apps - Photos - Apple Support