You can set a Punch Pro in various non-DMX mode. There are static color and color change modes, in addition to master/slave.
Chances are you'd want the color fade mode. You set that up according to the instructions(very straight-forward), and then adjust the speed from a setting from 1-99. Not sure which is slowest, so might want to play with that a little bit. You'd know in less than 5 minutes if 1 or 99 is the slowest setting.
Set that one up as MASTER and then set the other one up as SLAVE and connect a DMX cable between them and you're done. Also, you can have any number of slaves, but only one master fixture. So, if you like what you're seeing and need more, you can see that's no big deal.
Same thing with DMX as well.