The Yamaha YDP-161 is a digital piano known for its Graded Hammer Standard (GHS) action and AWM (Advanced Wave Memory) sampling, providing a realistic piano feel and sound. In contrast, the Kawai CN23 features the Responsive Hammer action and Harmonic Imaging technology, which offers a more advanced touch sensitivity and a richer tonal quality. Additionally, the Kawai model typically includes more advanced features like a broader range of sounds and Bluetooth connectivity, appealing to more versatile users. Overall, while both are excellent instruments, they cater to slightly different preferences in touch and sound quality.