Pushing apk's

i want to theme my phone more and i have a apk in the system/priv-app called SecContacts_OSup.apk i want to replacing it with SecContacts.apk do i change the name of the SecContacts.apk to SecContacts_OSup.apk or leave as is?

im using apk's from this thread
http://ift.tt/1tIlIGH

from xda-developers http://ift.tt/28Smf4f
via IFTTT