I think it's entirely reasonable that they come from the same place. 10% is about the right number to apply in both contexts if one was choosing arbitrarily. We

I think it's entirely reasonable that they come from the same place. 10% is about the right number to apply in both contexts if one was choosing arbitrarily. We are effectively 'decimating' with our layoffs. Though one notable difference is that with layoffs it's an excuse to drop so-called poor performers, but I believe decimation was more or less random i.e. drawing straws.