Any question answered...

But if he's just buying a laptop power supply, one with the same voltage but more current will be fine. All the sophisticated charging circuitry will be built into the laptop and/or the battery pack.

I've already bought it...

I'd worry that the new higher current charger would change things from just within spec. to exceeding specifications regarding heat dissipation, but then my background is more engineering than science.

I'd also be more than happy if you post tomorrow to say it works fine!