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Your rear diff is probably a H233b which has an oil capacity of 2.1 litres (4.7 litres for H260b). If you can post a photo of the rear diff looking from the rear of the car I can identify it for you.
Front diff I wouldn't be concerned about the difference.
Your throttle body is not unusual, the inlet ports will be the same.
Blocking the EGR and fitting a catch can will stop the build up reoccuring.
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