I believe that 11 speed is 5.62mm, and 10 speed is 5.88mm. Some commentators say that 10 & 11 speeds are close enough to be interchangeable, but in this case it wasn't close.
I did note that the chain fitted ok on one part of the chainring. As I had also problems fitting the bolts, I wonder if it was just out of spec, or wasn't a genuine product. I did buy if off ebay...