The main Winnipeg branch of the Bank of Montreal, which was built in 1912-13, was also designed by McKim, Mead and White. It is consequently quite similar to the Montreal one (photos all mine):
Elevation along Portage Avenue East:
Here's a contemporary rendering from my collection:
I recall that McKim, Mead and White were also consulting architects on the 1983 tower addition. I don't have a great photo of that but it actually tries quite successfully to fit in with the old building when you look from the north side. That building replaced the 1960s-era Bank of Montreal Building next to Eaton's that is now called Newport Centre.