Roland, Yamaha and Kawai has made many top line DP.
But in here, I wanna talk about
Roland HP-207, Yamaha CLP-380, CLP-340, Kawai CA-91, and Kawai CN-42.
I wanna ask about those DP.
From those DP, what is the most worth DP with their specs?
How does those DP compared with other?
Are those DP in the same level?

It's not really practical to go into a detailed comparison of the specs and features of each of these models. Basically, the CLP-380 and HP-207 are roughly comparable in features. The CLP-380 has a fancier case and more elaborate speaker system, but at a much higher price.

The CLP-340 is a more basic model which lacks some of the high-end features of the Roland or CLP-380. It is priced in the same general range as a Roland HP-203, but the HP-203 has many more features (although worse speakers, unfortunately).

What is more important than the specs is the feel and sound of these instruments. Yamaha, Roland and Kawai sound and feel very different from each other. Some people play a CLP-340 and HP-207 and prefer the Yamaha sound and touch, even though it's no comparison in spec.

Rather than get hung up on features and details, I'd decide on a budget and then try to personally play the Yamaha, Kawai and Roland instruments that you can afford. You'll probably soon find a favorite.