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While the peak usage is the same, they have other differences. The ten-charger setup will cause many fairly modest load changes on the electricity network, while the one-charger setup will cause a few giant changes. That may plausibly have some impact on the price of the infrastructure needed and what the power company will charge.

In order to charge 10x faster, you need to deliver 10x the current. That means all the wiring and electronics need to be upgraded to handle the huge increase without melting.

Also, the rest stop won't just be installing a single fast charger, it would install more than one. So you can't really compare 10 slow chargers against a single fast one. That means the wiring service for the entire rest stop would likely need to be upgraded as well.

A fast charger has AC-DC converter provide DC power to car, which is expensive. Slow chargers are AC, which are very cheap in comparison.

In your scenario what you're describing are all DC fast chargers.