Below you can see the front-view size comparison of the Panasonic ZS100 and Panasonic LX100 II. The Panasonic ZS100 is clearly the smaller of the two cameras. Its body is 4mm narrower, 1 mm shorter and 20 mm thinner than the Panasonic LX100 II.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.