Typically, yes, but I don’t think anybody has seen those modified. These are the only ones I’m aware of:
- user page : the file is called MyPage.szs from title 0100000000001013
- lock screen : the file is called Entrance.szs from title 0100000000001000
- news applet : the file is called Notification.szs from title 0100000000001000
- settings applet : the file is called Set.szs from title 0100000000001000
- all apps menu : the file is called Flaunch.szs from title 0100000000001000
- home menu : the file is called ResidentMenu.szs from title 0100000000001000
- home and applets : the file is called common.szs from title 0100000000001000
They probably exist in another .szs file but nobody has found/published them yet?