Below you can see the front-view size comparison of the Fujifilm X-T2 and Fujifilm X-E3. The Fujifilm X-E3 is clearly the smaller of the two cameras. Its body is 12 mm narrower, 18 mm shorter and 6 mm thinner than the Fujifilm X-T2.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.