[Q] Need help swapping apps.

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So i want to take the phone app out of eugenes macnut and toss that on my phone

The way i went about this was unzipping the macnut rom and copying the phone.apk going in through root explorer and plopped it in to my system/app/ folder.

the first time i did this it started an endless "force close phone.app" and had to fire up a backup i made in recovery...

the second time i tried it i replaced both phone.apl and phone_util.apk, this time i got a force close pop up two or three times then it went away... but nothing on the phone changed.

what am i doing wrong here.

edit:
i also tried just unzipping both roms i am using... swapping the files around and re-zipping and flashing... but it hung on the install and i was told thats because of the xml file does not know what the modification was so it does not know how to handle the changes.

:the explanation:
I just like the way it looks with the contact option in the tab. Also I dont like how the "log" list either one thing or everything; I prefer to see incomming/outgoing/missed and not have to have a full thing of text messages.