News to me, but something to be looking for.
I remember, when I had a Jeep, there was a whole bunch of brake calipers mis-labeled, right instead of left side. They are NOT interchangeable, my mechanic found out trying to bleed the stupid mistake. The nipple was on the bottom instead the top of the caliper. Called a "Jeep guy" friend and he knew exactly what the problem was. Swapped it out and all was good. Had to search through several to find one that was correct and had the parts guy ship the mistakes back.