assuming the branche and the trunk have the same radius and other characteristics.
Axon branches/collaterals have probably an impact on AP shape & propagation but I would consider those impacts as negligible compared to other characteristics not yet taken into account in ANN.
Though, there seems to be some studies about this (Dominique Debanne):
https://hal-amu.archives-ouvertes.fr/hal-01766862/document
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