Are shields and peripherals intended for the Arduino Uno also compatible with the GR-Peach board?

By compatibility I mean:

(a) Electrical compatibility as in clock speeds, logic levels (3.3v), signaling protocols etc.

(b) Physical compatibility as in pin for pin match ( I believe that Renesas has mentioned this, just double checking)

So if we're not able to easily obtain Renesas camera, GPS and LCD shields etc. in India, can I substitute them with Arduino Uno compatible shields that provide similar features?