Replacing iPhone 4 Screen w/ Water Damaged iPhone 4

[abloomy09]

I have a very cracked iPhone 4, both front and back, and I am looking to replace the glass. The iPhone itself works fantastically. My original iPhone 4 took a dive into a swimming pool. Surprisingly, I was able to use it for a few weeks, but eventually it took a turn for the worst and crashed and never came back. The screen on it worked fine though. I'm wondering if I would be able to replace my cracked iPhone glass with the glass of the water damaged iPhone. Does anyone think the LCD was damaged at all in the water? I don't really know how the screens work, but everything seemed fine when I was using it after the water damage, until it crashed. Help me out with this? Thanks!