How do you know?
There’s no functional difference between the two pricing structures. Both charge more for peak, less for off-peak. This allows both Arby’s and Wendy’s to have higher prices during the peak without losing customers during the off-peak; or to gain customers during the off-peak without losing profits during the peak.
Either way, it’s the same thing. It’s just branded differently. And it’s easy to do things like that during a time of rising prices, when everyone’s prices at all times are higher than they were a year or two ago.