This slide illustrates how much Mastcam-Z inherits from the zoom version of the Curiosity Mastcam. Only the optics require major modifications, because of the switch from fixed-focus to zoom. The entire camera head with its electronics, detector, and electrical interfaces will be identical. The filter wheel will have a slightly different set of filters and the filters will be rectangle-shaped rather than round. The heaters will have minor modifications, and the rover electronics will have slight changes as well.
This image is in the public domain.
Original image data dated on or about November 21, 2015