Oh, tons.
For instance, if workers demand that 'their' plant stay in Michigan, rather than move to Mexico, that could be painted as economic nationalism. Similarly, rejecting imports that compete with domestic production.
Nationalism in this sense seems to be a shield that workers use in an effort to advance their struggles. We might prefer them to strike out more boldly, but it's not simply our decision to make, obviously enough.
By contrast, imperialism seems to be about the use of force in other countries to capture resources, control markets, despoil the environment, or even advance domestic political concerns (i.e., start bombing Iraq at a critical moment in the impeachment proceedings).
What does the first have to do with the second?
cheers, mbs