Post Stock 4.2.2 i9200 Samsung Phone.apk and Contacts.apk

Need help in changing my AT&T Galaxy Mega 6.3 SGH-i527 stock white phone dialer and contacts into the dark themed stock samsung dialers and contacts. I tried changing the secphone.apk and seccontacts.apk with the apks from 4.2.2 i9200 rom but i get force close