With fuel injection does one balance them
For EFI the action is the same. But, you are "syncing the throttle bodies". Same adjustment screw location. While you could use a manometer if you have one and the skills & plumbing parts to interrupt the vacuum lines the better tool is an OBD-II diagnostic tool like TuneECU or Dealertool if you are a DIY type. It is supposed to be a dealer check item for most any scheduled service, not that it happens.