DIN 5480 splined bores.
DIN 3967 tooth thickness tolerance.
DIN 867 1.25/0.20/1.00 ground flanks and root.

DIN 5480 N - Internal Spline Hub with 9H Tolernace
DIN 5480 W - External Spline Shaft with 8f Tolerance
One of each above would mate with these tolerances with a slide-fit.