Well, the problem itself is in the right lower leg which is slightly longer, not the knee.
Since he's just a repaint, i assume it has the same issue. (i just have the PoC one)
There's no fix for it, since swapping knees doesn't works, but there's a way to fiddle with the knee and the double articulation to make the legs look even.
Just stand him straight, a bend the right leg forward at max, but using the lower part of the articulation. The leg will look deformed, but simply push the leg back, but using the swivel of the upper part of the knee.