Even if the degree I am claiming is MBBS as education?
Yes any degree you claim, the work-ex has to be appropriate for that NOC.
You may use the residency from MD/MS/DNB for MBBS work exp but it needs to conform to the relevant NoC, unfortunately, that will be difficult as even GP requires a family medicine residency in Canada.
Would love to get any further reference and information in this regard.
Below are some pertinent links to refer to:
http://www.cic.gc.ca/english/helpcentre/answer.asp?qnum=394
http://www.directionsforimmigrants.ca/profile/show/id/154
http://www.royalcollege.ca/rcsite/home-e
Please note the following are my personal comments:
Immigration is a once-in-a-lifetime watershed moment which would change the course of your and your family's destiny for the better.
Why would you want to risk the same in terms of time, money and resources as well as legal entanglements (PR Rejected status etc.) when there are grey zones.
My two cents - if the residency(to have been started after the concerned degree has been awarded) mirrors a substantial number of roles and responsibilities to your chosen NOC then all should be well. Otherwise, all else will be a waste.