help to compare nand flash

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hi all, i'm alex.

I want upgrade my nano ipod from 4g to 8g ( or more) with another nad
flash.
I have taken the idea from http://www.multiarcade.com.

In my ipod nano, there are two memory nand of 2gb joint in parellel
with code K9MBG08U5M PCB0 for 4g in total. (i have made a photo in this
link http://img162.imageshack.us/img162/5744/memorianandfp1.jpg)

I have found this nand flash with this code: K9NBG08U5M-PCB0
(data sheet and tecnical
http://www.samsung.com/Products/Sem...C_LargeBlock/32Gbit/K9NBG08U5M/K9NBG08U5M.htm
)

Ihave also find this PDF
http://www.samsung.com/Products/Sem...08uxm_rev10.pdf#search="datasheet K9NBG08U5M"

But in the site www.multiarcade.com is recommended this mand flash
http://www.samsung.com/Products/Sem...C_LargeBlock/16Gbit/K9WAG08U1M/K9WAG08U1M.htm

Now, i am not able to compare the datasheet (sorry, but i am newbie)
and i haven't fount the datasheet for memory of my ipod ( with code
K9MBG08U5M PCB0)

Thing you say of it? Is possibile this for you?
Are equal the various nand flash ( skipping the capacity )?

Tnx very much, and sorry for my bad english!!!!