The main difference between the Ecovacs Winbot W2 Omni and the Ecovacs Winbot W2 Pro Omni lies in the additional functions and features. The Winbot W2 Pro Omni offers a portable station with an integrated battery, a two-in-one cable for safety and power supply and automatic cable management. It has a 12-level protection function that includes more hardware-based protection measures. In addition, the Winbot W2 Pro Omni has a longer battery life and more efficient cleaning thanks to WIN-SLAM 4.0 technology. The price difference of CHF 104 reflects these advanced functions.

Digitec's answer is unfortunately incorrect. The 2 models have the station with integrated battery, protections and WIN-SLAM 4.0.
The 2 differences are: 2 additional cleaning modes, and the possibility of using it when plugged into 220V (the W2 Omni non-pro does not work if the battery is plugged in).