I just wanted to ask if there is any visual differences between Gibson and Epiphone Les Paul pickups.

All the threads I see are related to the audible differences but I suspect my Gibson may have Epiphone pickups and wanted to put this worry to bed.
They both have the Gibson logo stamped on the bottom but the solder joints are not original (the black Earth lead was actually not even soldered when I first looked) and the guitar doesnt sound as good as my old Les Paul, not even close, its quite muddy and there is little difference between bridge and neck pickup tone.
Thanks