Panasonic LX10 has a 20.0MP 1" (13.2 x 8.8 mm ) sized BSI-CMOS sensor . On the other hand, Panasonic LX100 II has a 17.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features Venus Engine processor.
Below you can see the LX10 and LX100 II sensor size comparison.
As seen above, Panasonic LX100 II has a 1.9x Larger sensor area than Panasonic LX10. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.