well, one is ddr3 and another is ddr3l which is important difference. As looking on the net, the g450 have ddr3 slots. And max capacity is 4gb (so, I presume one 4gb kit or two 2gb kits).
Cpu on this one is kinda slow so even with 4gb ram and 120gb ssd you will feel some sluggishness. But, I would say that for the really basic tasks...it will be ok. If it will be for basic surfing and little (word, excel...) business...why not go gor one the linux versions? They do work better with older hardware?