10 speed crank with a 11 speed drive train?

[alcatraz]

Short answer: No

The inside width of the links is the same.

Long answer: The spacing between chainrings could be different. 10s isn't as bad as running a 9s crank. When the spacing between the rings becomes too large there is a chance the narrower 11s chain could get stuck between the rings.

Also it's possible you won't get 100% of the intended front shifting performance with different chainring spacing.

However this is usually not an issue. Generally it works fine.

[Marin]

I'm running 10s and 11s Red cranks, they are identical.