RAM from VGN-SZ4XWN/C into VGN-Z17GN?

HI, I have a broken Vaio VGN-SZ4XWN/C with what i understand to be 2Gb of DDR2 RAM.

I have a working VGN-Z17GN with what i understand to be 4GB of DDR3 RAM.

Can I put one into the other?

1. Is it physically and technically possible?

2. Is it do-able by me, never used screwdrivers on my laptops but willing to have a go? (I used to enjoy Lego!)

3. are there any benefits to doing this (faster machine)?

4. what are the risks?



Or would it be better just to go out and buy some new RAM for my VGN-Z17GN and pay someone to put it in?

Is it worth selling my broken Vaio (NB only screen is broken) for this pittance of a low price?

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