Hello,
They are different. The CD/Download version has the ability to enter your information using the Forms method or EasyStep Interview. TurboTax Online only has the EasyStep Interview.
If you have a Mac, you need to use TurboTax Online.
Here's some additional resources:
CD/Download products: http://turbotax.intuit.ca/personal-tax-software/download-tax-software.jsp
Online: http://turbotax.intuit.ca/personal-tax-software/online-tax-software.jsp
TurboTax options for Mac users: https://support.turbotax.intuit.ca/turbotax/en-ca/faqs/Order-Questions-Comments/TurboTax-options-for...
