The gap is mostly about land cost, not construction cost. A comparable build costs roughly the same to frame and finish nationwide, but the underlying lot in a larger coastal market carries a far higher price simply because there is less of it, which is the main reason the same budget stretches further here.
Within Saskatoon itself, the same principle applies on a smaller scale. A newer home farther from the core generally sits on a larger lot than a comparable home closer to downtown, so more space is still a location question even after you have picked the city.
How much further your specific budget goes depends on the property type and area you are comparing, not a single blanket multiplier. Get your hand-reviewed valuation from Joel Dyck.