If you check this link:
You'll see a chart in the PDF file that shows the use of all the AB units as well as the Zeus units using the Vagabond II portable power unit. I suspect that the use of the Zeus will wear the battery out more quickly. Read the PDF caveats carefully and I'll think you'll see that point.
I don't see any reason you couldn't use the Vagabond II with the Zeus units, but you'll have long recycle times and 100 to 200 flashes. The implication of the PDF file is that it uses the full power each time, even if you have the head stopped down, but I'm not sure as the wording is a bit odd.