Below you can see the front-view size comparison of the Panasonic ZS70 and Olympus E-M10 III. The Panasonic ZS70 is clearly the smaller of the two cameras. Its body is 10mm narrower, 17 mm shorter and 9 mm thinner than the Olympus E-M10 III.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.