Below you can see the front-view size comparison of the Fujifilm Z900EXR and Panasonic ZS70. The Fujifilm Z900EXR is clearly the smaller of the two cameras. Its body is 11mm narrower, 8 mm shorter and 23 mm thinner than the Panasonic ZS70.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.