I'm talking about these things, of course.

http://www.games-workshop.com/gws/ca...Id=prod1860245

I ask because I think it'd be neat to have a Chaos Daemons army for 40k using the round bases, then putting them on those trays for use in Fantasy (or similar homemade bases, which is the likely course as these appear to only be four ranks wide). So is that allowable (of course, one could simply use the square bases for 40k, but I don't care for square bases in 40k)?