Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Panasonic ZS40 and Panasonic ZS35 side-by-side from the front, back and top in their relative dimensions. Panasonic ZS40 has external dimensions of 111 x 64 x 34 mm (4.37 x 2.52 x 1.34″) and weighs 240 g (0.53 lb / 8.47 oz) (including batteries). Panasonic ZS35 has external dimensions of and weighs 305 g (including batteries).
Below you can see the front view size comparison of Panasonic ZS40 and Panasonic ZS35. Panasonic ZS35 is clearly the smaller of the two cameras. Its body is 4mm narrower, 2mm shorter and 2mm thinner than Panasonic ZS40.
Now lets look at the top view comparison of Panasonic ZS40 and Panasonic ZS35.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Panasonic ZS40 is significantly lighter (65g ) than the Panasonic ZS35 which may become a big advantage especially on long walking trips.
Unfortunately neither Panasonic Lumix DMC-ZS40 (Lumix DMC-TZ60) nor Panasonic Lumix DMC-ZS35 (Lumix DMC-TZ55) provides any type of weather sealing in their body, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
Panasonic ZS40 and Panasonic ZS35's LCD screens has the same diagonal size of 3.00".
On the other hand, Panasonic ZS35 features a Tilting screen
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels whereas the Panasonic ZS40 has a fixed type screen which provides less flexibility in shooting positions compared to ZS35.