can I add ddr3 ram to a laptop supporting ddr3l

[Tahsin_1]

I recently bought the DELL INSPIRON 15-7559. It comes with 4 GB DDR3L RAM. I have an old HP laptop which I don't use anymore. It has 4 GB DDR3 RAM. If I add the RAM from the old HP to the Dell, how will it affect its performance? Will it be better with the extra 4 GB of RAM, or will there be compatibility issues? This might be a really basic question, but I'm a noob so bear with me folks! Thanks!

 

[Saga Lout]

Can't be done on grounds of Voltage differences as far as I know. Don't try it until someone with specific RAM expertise comes along.

 

[ffg7]

what is the voltage marked on both type of ram?
http://www.tomshardware.com/forum/319013-30-what-ddr3l#16310934