Jup. The whole 'simultaneous' circle jerk started mid 1980's if I'm not mistaken. Some countries a bit sooner, others a few years later.
Dutch magazines and KM lagged behind English several months.
And even today KM aren't 100% identical everywhere.
So the thing you noticed is simply the Canadian KM lagging behind US in those years.
I bet you can easily verify this by taking a sample of other KM you have in hardcopy and compare to the online version. You'll find similar differences for less controversial topics too I think.