Canon R6 II has a
24.0MP Full frame (36 x 24 mm ) sized CMOS sensor and features Digic X processor. On the other hand, Canon 6D MII has a
26.0MP Full frame (35.9 x 24 mm ) sized CMOS sensor and features DIGIC 7 processor.
Below you can see the R6 II and 6D MII sensor size comparison.
Sensor Size and Resolution Comparison image of Canon R6 II and Canon 6D MII Cameras
Canon R6 II and Canon 6D MII have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Canon R6 II
or the
Canon 6D MII ,
including hyperfocal distance.