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SAME DIVE, DIFFERENT NDL?
That is normal. Dive computers may use different algorithms, different conservatism settings, different GF High values, different assumptions about ascent rates, or they may be carrying different tissue histories from previous dives.
For no-stop dives, GF High matters directly: it defines the surfacing limit. A lower GF High usually gives you a shorter NDL because the computer wants more distance from the model’s original limit at the surface.
So your buddy’s longer NDL is not automatically “better” or “more correct”. It is simply a different calculation.
A team should know the settings of the different computers and decide in advance whether to stay within the most conservative no-stop limits, or to accept decompression and follow the most conservative setting accordingly.

Punkfish Academy · Decompression Theory
Link: https://punkfish-academy.com/en/decompression-theory/