Nationalism is geared toward the organization and patriotism of ones own country or gathering of other nations to become part of the government within flux borders. Ho Chi Minh was a nationalist.
Jingoism is the idea that we should put great spirited effort into demonstrating how foreign countries should be run through policy but without actually adopting them as citizens. Gen. Douglas MacArthur was a jingoist when reconstructing Japan.
So, can Nationalism be Jingoistic? If Canada wanted Texas and its people to be a province and Canadian citizens, that would be a nationalistic endeavor. (And the other 49 states would probably help them).

If Canada just wanted them to change for any other reason than to be governed by them, that is jingoism. I think.
Oy, where's that Excedrin bottle?