Simple solution, pretend that you need to buy a new AC adaptor for both laptos.
then simply compare what he specs show.
Most common is 19V @ 4+ amp.
The volts/amps do NOT have to be exactly identical.
What is listed is that the adaptor will provide a given voltage at a given MAX current level - NOT what the laptop requires.
ie if 19 Volts then the laptop will determine the current and as long as you are BELOW the current rating you are fine.
You will find that many of the chargers really supply more than 19 V when current is less than the rated value - ie NO load the output may be as high as 22V.
Voltage if within a few tens of a volt and current rating is within a few tenths of a amp you should be fine.
Laptop batteries are generally...