Liquids are incompressible, that is to say, volume does not change in response to pressure. There may be some "flex" in the lines, but it is inconsequential. Pressure at one end of a line is the same as all points in a line and pressure transmits instantaneously. A difference of a few inches one way or another will not make one whit of difference in timing. Rate of flow is affected by distance as a result of resistance to flow at the walls of the tubes, but I'd seriously doubt that it would be affected at these short distances.

My guess for the reason the lengths are the same is more for cost - only one part to manufacture, track, and maintain in supply rather than five. No matter the length all would have to be formed so that cost is fixed.

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mjk

'84 300SD 119KMi (Liesl der Diesel)
'84 300D 326KMi when the oil left (former parts car)
'82 300SD 253KMi (new parts car)