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Hovis-
I'm pretty sure that the cog spacing is different for 11spd but the 11spd shifters pull less cable per click, it's the ratio of cable pulled to cage movement that stayed the same from 10spd to 11spd meaning you can use either type of mech but the shifters have to match the cassette
TL;DR match shifters to cassette
HelicopterHelicopter
FFS len
It might be that the difference in cog gap size is so small that the slack the jockeys have can make up the difference.
But yeah I've never actually tried this stuff.