Using a charger with a wrong voltage (typically to high a voltage) can damage your laptop, but using something with too high a current rating won't. (Using something with to low a current rating might fry the power supply, but not the laptop).

As the difference in voltage is small, it should be OK, but really I doubt anyone would stick there neck out and guarantee this. (I believe it should be OK because your laptop will have circuitry in it which will filter and re-regulate the voltage on-board - it must do this to charge the battery, and 1 volt is not a big deal to most of these kinds of circuits). Its probably not ideal though.

Using a charger with the wrong voltage rating can potentially damage your laptop. This is typically caused by too high voltage. But using a charger with too high current won't damage your laptop. Using a charger with too low current rating might fry the power supply, but not the laptop.

As the difference in voltage in this case is small, it should be OK. But I really doubt that anyone would stick their neck out and guarantee this. I believe it should be OK because your laptop will [most likely] have circuitry in it which will filter and regulate the voltage on-board - it must do this to charge the battery, and 1 volt is not a big deal to most of these kinds of circuits. It's probably not ideal though.