Hi Kitkat,
I have owned a PR903 for some time, which is very similar but a later model than the 902.
I would estimate it came out more than 20 years ago.
It is a digital piano of excellent quality, but not compatible with KN7000.
Touch is slightly lighter than acoustic piano.
Lots of power (240 watts), but less voices and styles than KN7, although most do copy KN7000.
Hope this helps.

Ray