Canada is clearly the larger of the two: about 9,872,102 km² km² against 16,879,701 km² km², roughly 1.7× at true size. Drag one onto the other on the map above to feel the gap.
Canada sits in North America, Russia in Europe. On the old Mercator map the latitude gap distorted how large each felt beside the other; at true size the answer is simply 1.7×.
The old map muddied it further: Mercator inflates Canada about 4.1× and Russia about 6.1×, so on a Mercator-style map this pair appears 2.5× apart instead of the true 1.7×.
Canada fits 1× into Russia.