In my experience WES considers all masters degrees (MBA) equivalent to bachelor's degree in Canada except the MBA completed from IIM and IIT. You can check the same in equivalency tool. Generally IQAS provide Master equivalency for non IIT , IIM MBA's.Thanks.
I did tried to find out from the mentioned link, unfortunately no option select Post Graduate Diploma. The options are either Bachelors or Masters.
Though I see there are many Canadian Universities who are offerings same degree. Curriculum is almost same and duration is 1 year with Canadian Universities.
I got my MBA evaluated from IQAS and I got masters in evaluation. It was 2 years full time program after my engineering.. If you are looking masters equivalency for your course then IQAS is your best bet. I got my degree evaluated in less that one month from IQAS