My laptop charger,i.e., 20V - 3.25amp . is it ok to use a20 v - 3.5amp charger instead the original rating.?

I lost my laptop charger. in the market I am not getting same rating charger, i.e., 20V - 3.25 amp. the saller says instead of original rating i can go for a 20V - 3.5 amp. and it is safe only it is problematic if i go for a different Voltage.