the answer is yes and no !
Yes: technically it can be used, but you need a higher amount of power (watt).
if the laptop needs 20V 4A and the adapter gives only 20V 3.5A it might not even start (maybe if the battery is fully charged)
so if the adapter gives 19V 3.5A it will not work (if it does it is not good for the Adapter, might become warm and eventually burn out)
if the adapter is 19V 6A, it might start the PC but you will have strange side effects.
So, NO, I would never change the adapters of laptops !!!!
My advise, get a new adapter or an adapter from the waste disposal facilities (most of them are still working and the laptops broken)
Cheers, Louise.
Modified: Ah to A !!!