Hi flembot. Congrats on getting the grant. Here's the difference between the two categories:
Category A: Joseph-Armand Bombardier CGS Doctoral Scholarships are valued at $35,000 per year for 36 months.
Category B: SSHRC Doctoral Fellowships are valued at $20,000 per year for 12, 24, 36 or 48 months.
You'll have to ask your roommate to forward a copy of the Appendice sent with your letter to determine the number of months your grant's valid for.
Hope this helps.
PS. Thanks to all of you who offered your congrats earlier on today and congratulations to all who have been successful. If you've been unsuccessful this year, keep trying. It will pay off eventually. All the best!