Scooba 350 vs Scooba 330
images from manufacturer

There is no change to the basic cleaning machinery, the only difference between these 2 Scoobas is the area they are able to cover per single charge.
The Scooba 330: clean 250 square feet per battery charge.

The Scooba 350: clean up to 500 square feet per battery charge.

Otherwise, they are identical.

Share your review if you know more about these 2 robotic floor sweeping and mopping equipment.