Your last purchase, the Touring Road King Seat, is done through the Global shipping program, which means all import charges are levied ahead of time. I don't know the item number of the second one, but it may not have the Global Shipping Program fees tacked on ahead of time. Expect that, when Canada Post delivers it, you will have to pay GST/HST and any import fees if the item is more than $20 in value. It is not always charged, but for larger items, it usually is.
Rick
"Egotism is the anesthetic that dulls the pain of stupidity" - Frank Leahy