Megawatt, they are completely different....American ryes are spicy, peppery, full mouth whiskeys....wheras the Canadian ryes are much lighter, and have a very different taste profile. I just poured shots of Alberta Premium 25 and Rittenhouse BIB. My limited notes are as follows.
AP - light gold color
Ritt - amber
Nose - AP bit of alcohol - slight what I call "formaldehyde or nail polish" that I find in most Canadian whiskeys....Gilman refers to it as "piney"...(could it be the neutral spirit portion?)...and sweetness
Ritt - more like a bourbon ...rich, sweet - honey
Taste AP - light with a smooth round sweet finish plus the "piney notes."
Ritt - immediate liveliness, thicker feel and more complex notes, mild burn
> 100 proof vs AP 80 <
Similar to the difference between a rich lowland Scotch and and Irish whiskey.
Really no comparison other than the rye base...that is what amazes me..they are so different.