Does A DSLR APS-C Camera Produce Creamier Bokeh Than A Mirrorless APS-C Camera?

Put the same lens on an mirrorless APSc camera via an adapter and then on a conventional APSc DSLR, and the look will be identical.

What you are after is probably something like the fairly shallow DOF macro capability of the Sigma 150/2.8 on FX. This isn't a constant aperture lens, so its going to be between f2.8 and f4.

Equivalence is a wonderful thing:

The new Oly 75/1.8 should be able to give a very similar look - but of course its not a dedicated macro lens, so it depends how close you want to get.