In this regard, it is completely different, as has been discussed in other threads on similar projects. (See the following, just as one example:
Smart battery wall light switches for use with Smart Bulbs (UK). )
The Lutron pico is sold with a shield that is used if you intend to insert it in the wall, which creates a separation between it and the house wiring.
https://www.amazon.com/dp/B00JZRAFEA/ref=asc_df_B00JZRAFEA5346449/
They are only safety rated because of this method of installation.
See page 15 in the official Lutron installation guide:
The Hue, Eaton, and Popp battery operated switches are all designed to be surface mount.