Re: Timing belt replacement.
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TDC on 1 is TDC on 4.
2 and 3 have TDC together too. Most inline fours are like this.
Whether it's the top of the compression or exhaust stroke is decided by the camshaft position.
Presumably the timing point on the cam sprocket would be top of the compression stroke on cylinder 1.
Because these motors are electronic fuel injection, it would actually run even if the HP fuel pump was completely mistimed. The common rail will still be pressurised and the injection timing comes from the crankshaft and camshaft
position sensors.
Apparently getting the HP fuel pump wrong causes excess vibration and can eventually strip teeth off the timing belt.
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