If I could jack the car up a measure the 360's I would
But best I can do for now is show the visual difference by photos off the net. Left is an S8 385mm, right 360mm. I'll make my own side by side photo when they eventually go on.
The addition of the letter at the end can make for a completely different part, (as I found out matching ABS units) But the difference between the S8 and W12 is probably the black lacquer only.
Hope that helps a bit