It seems to be very similar indeed;
In the slatted rack setup I use: 10 frames of 1-1/4" spacing are used with small-cell (similar to what MB does), this provides 20 comb surfaces. With side racks the bees will regularly use the outside comb surfaces for brood. Without side racks the bees seldom use the outside comb surfaces for anything but honey and pollen. So we have the extra ventilation afforded by the racks, extra space for the bees to allow them to stay out of the congested brood nest, and a little less weight (one less frame and comb).
11 frames without slatted side racks (22 comb surfaces, the outer two seldom if ever used for brood) = 20 comb surfaces for brood.