I should have been more specific. What I meant was that the diphthong in those word pairs is the same in American English but not in Canadian English. You are right about the phonemic difference in the following consonant (its a voicing difference) though. Canadian raising is triggered by voiceless consonant codas in stressed syllables where the diphthong is [ow] or [aj].
I still argue that the diphthongs aren’t quite the same (as the [aɪ] changes to an [aɪ:] before the voiced consonants in the second word of the pair….at least in my idiolect), but thanks for the clarification.