If there is no domain specific information held in the OCR or the init file, then changing the domain name will not affect the CRS.
Check Metalink note:
Does The DNS Name Changing Cause Any CRS Problems? (Doc ID 788854.1)
RAC on Windows: Oracle Clusterware Services Do Not Start After Changing Username or Domain (Doc ID 557273.1)
I am looking for notes /forum where I can find similar activities are explained.
I have do this on Solaris-10,So RAC on windows seems not helping me.