try them and see if it works better or break anything. Since MBP13,2 and 13,3 models with touchID, you'll need to add NotouchID.kext to prevent slow login issue.
No they are not, you can remove them if you like.
@Chandara It is exactly the same as yours, with only RAM 8 gigs and WiFi AR5B95. Yes you can use my EFI and chances are you will have to create your own USBPorts.kext.