Working two different shifts at two stores in one day, one markout or two?

I'm helping out another store (approved overtime, how can I say no??) and working my full shift at my home store in the morning, have an hour break to commute to their store, then I'm closing with them. I only get a 10 with them but I know that if I get my lunch at my home store at like.. 11am-12, I'm gonna be starving. Do I get another markout since it's technically another shift? Should I ask my manager? Is there a written policy on this? My SM is not that knowledgeable..

Edit: I do this for them like.. 3+ days in the next week or so so it's not like a 1-off thing either. If it was just one day I'd probably just suffer through.