I would have said the Sequani were further north.
Sequani are considered neighbouring Aedui, and Helvetii after their settlement in modern Switzerland. How much south is anybody's guess as they weren't AFAIK neighbouring Allobroges, but while Sequani didn't (or no longer) extended their archê up to the Rhine, they still were bordered by Jura. Their northern border is harder to determine, tough, but as most central Gallic peoples they might have a southern tropism.
I see you used the Norman color for Armorica.
I'm a big believer in color recycling : as I said, we might lack enough colours for Central Gaul only, without even mentioning the 'arguably less, much less known situation in Belgica and Germania.
Frankly, it's a problem for Celto-Ligurian peoples, whom hegemonies are berely discernables except for Vocontii : as the Roman intervention more or less provoked a domino reaction from regional hegemonies, having the possibility to highlight Allobroges could be interesting.
Are the Green one Veneti (Vennes) or a different tribe?
They are, with their client relation with Namnetes. It's not entierly clear if Veneti were tied up with Armoricans, but I think the contrary or at least to highlight their own network makes more sense.