The laptop will only draw the current it needs so you will not fry anything. You can use an adapter with more amps and the same voltage and the same physical connection without any problems. It will even charge the battery faster. However, please give the HP Part numbers of the 90W charger you propose to use. Before I tell you it's OK I want to be sure it is the same connector and voltage as the specific 65w adapter recommended for your laptop.
Hope this helps! Keep me posted.
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