Noticed that the early versions of The Black Series 6" #20 Scarif Stormtrooper Squad Leader that I purchased have different Shin and Knee armor on his right leg then the later versions. It looks like when Hasbro assembled them earlier on, they used two left Shin and Knee parts instead of what we see on the later version. I am leaning more towards a error on this then a variant.
I have only been able to find a couple of the figures with two left shin and knees that are packed in boxes with date stamps 62251. I took a comparison photo. The one on the left is the error with 2 left shin and knees and the one on the right is the later version. If you have the one on the left please let us know the date stamp on your box.