Iphone 4 logic board replacement?

I have 2 iphone 4g's.(a)16gb-Factory Unlocked.(b)32gb-Japan Softbank Locked.
here's my question, can i put the 32gb logic board to my 16gb logic board to increase it's memory space? If possible, after replacing, is the iphone will be recognized as the japan softbank locked iphone?

Just changing the memory doesn't necessarily change the network settings. But you would be wise to assume that it would change the phone to Softbank and locked. Best luck.

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