Can i use HP 90 watt power supply in place of my 120 watt?

I have an HP Elitebook 6930p, that uses a 120 watt power supply.  It's output is 18.5 volts and 6.5 Amps.
I have another power supply that I want to use when I take my laptop home.  It is from a different HP laptop computer and is only a 90 watt power supply.  It's output is 19 volts and 4.74 Amps.  Can I use this power supply to run my laptop?  Thank you for your help.  Al

i have hp pavillion dv6t-7000 quad edition and it has 120 watts 19.5 volts but unfortunately the charger is not working anymore,ive tried my gfs dell charger which is 90 watts 19.5 volts...its workinng on my laptop but if you play games like nba 2k13 it will gonna be so laggy or very slow....i bought 120 watts 18.5 volts smart ac adapter on amazon and its working on my laptop also but im still experiencing laggness a little bit...but its better than the 90 watts 19.5 volts of my gf...maybe that her charger makes my laptop get a lil bit slower and laggy....now im planning to reformat my laptop to put it back to its normal speed again...

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