Exactly, the principal is the same when porting. Ill post another link with different system apps to port from.
However if you choose to skip that and proceed to framwork.jar instead that entirely up to you.
If you notice the screen shoot above I specifically named a main folder on external sd and it 2 sub foulders (original and Mod). Before you begin copy original folder from your system and place it in orginal sub folder. And do the same for you port to mod folder. Rename your mod from framework.jar to framework1.jar. That way you can copy and past it. If you do not change the name your moded framework.jar you won't be able to past it to system because it will not allow 2 folders, files, jars, apps..... etc with the same name