Hello from New Zealand.

I have a 2011 RVR (Japan import), I am wondering if accessories listed for 2011 ASX would fit my car?
For example I am looking for weather shield and roofrack. Thank you.

 

Yes, RVR and ASX are just different names for different markets. Engines may or may not be the same but body parts are. If you buy OEM parts you should not have any problem. Your description of roof rack and whether shield are not obvious to me. Keep in mind that there are two different types of roof crossbars depending on whether your car does or does not have roof rails. When it comes to roof rails, stay away from the ebay and Aliexpress supplied items. They mostly serve cosmetic purposes only.
For further reading about this topic read post #875 and the references therein in this thread.
I am not sure what whether shield is, I can only suspect it is a hood/bonnet deflector.