Nikon Z6 III has a
24.0MP Full frame (35.9 x 23.9 mm ) sized Partially-Stacked CMOS sensor and features Expeed 7 processor. On the other hand, Panasonic BS1H has a
24.2MP Full frame (35.6 x 23.8mm ) sized CMOS sensor .
Below you can see the Z6 Mark III and BS1H sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon Z6 III and Panasonic BS1H Cameras
Nikon Z6 III and Panasonic BS1H 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
Nikon Z6 III
or the
Panasonic BS1H ,
including hyperfocal distance.