No, not on the 6X. They look the same. Technically the thick lines of the MIL come in a little closer, but without looking closely side by side you'd never notice the difference.
The 6x mil was thinner than which scope with MOA?
The difference in the thick bars on the 6X is 4 MOA vs. 1.2 MIL. 4 MOA converts to 1.16356 MIL so technically the mil is thicker (.036 mil thicker). I can’t see that difference.