I wish I would have known about this site before I retired. I would have been out there for you actually measuring. (I rarely wasted my down time)

The seat pitch should be the same, but the fact that the seats at the exit row have more legroom may make the one forward look smaller.

The seat pitch is displayed right here,
http://www.aircanada.ca/services/business/if101a.html
and is totally controlled by the airlines, not the manufacturer. Air Canada prides itself on keeping the seat pitch competitive, so take along a tape measure and let Air Canada know if it is less. This seat already has limited recline, so it is already not as comfortable.

Thanks