Answer / 7anoter4

Something is not correct. If VL_L=415 V then VL_N=240 V
[not 230 V] and then

both calculation results will be the same [no error].

Answer / 7anoter4

The transformer actual load [apparent power] S=0.23*
(163+150+147)=105.8 kVA.

You may calculate approximately taken the average current
(163+150+147)/3=153.33 A and the formula sqr(3)
*0.415*153.33=110.2 kVA [4% error].

But this is not the rated power. The rated power and the
rated current have to be written on manufacturer rating
plates.

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