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if the phones are of the same gen, you can definitely replace them.
youtube has a ton of tutorials and all you'll really need is a suction cup and a small screw driver, kinda like the ones that come in eye glass repair kits.
one younger brother put his white i phone throught the wash and was broken, other one had a black ipone and it was shattered on the top, he brought the old screen to the mall and they guy siad it doesnt work that well and the water ususally gets under the screen, so bring it to a mall and the guy bought the watered damaged i phone for 40 bills, credit and my brother got a new screen for 40 bucks and an otter box for 20 def worth it