The JB and Distortion are rumoured to be the same wind, but with a different magnet. Others say they're similar, but not exactly the same. Same goes for the Invader bridge and JB. The Full Shred bridge is rumoured to be a Custom 5 with hex screws, while the Full Shred neck is a Jazz with the same features.
The voicing of the coils is different in both cases. that's something that simply comparing DC readings will never tell.A Full Shred set is essentially a Jazz Neck and a Custom 5 Bridge with all screw bobbins and hex screws.