Geoffj – both adventure orientated bikes, but that’s as far as the similarities go.
Longitude is build with alt bars or standard MTB bars in mind. Fargo is built for drops.
Longitude is way longer in front end, and slacker in head angle.
Longitude is built for 29+
Re cosmetics – they’re nowhere near the same colour. Longitude is grey with blue, not champagne coloured.
Struggling to see the similarity apart from the adventure slant, but Longitude is more of an MTB/adventure bike, Fargo is more of an off-road tourer.