they both say 'increase' and don't give a type, they should stack. but i would look at sniper goggles first
I was looking at doing a ranger rogue doing the sniper archetype and the ninja trick of the same name deadly range? Would they stack or is it one or the other?
Ninja Trick Deadly Range (Ex): "A ninja with this ninja trick increases the range at which she can deal sneak attack damage by 10 feet. A ninja can take this trick more than once. Its effects stack."
Rogue Sniper Archetype Deadly Range (Ex): "At 3rd level, a sniper increases the range at which she can apply her sneak attack damage by 10 feet. This range increases by 10 feet for every 3 levels after 3rd. This ability replaces trap sense."
Setting aside whether you can multiclass rogue and ninja (since ninja is an alternate class for the rogue core class), if you could, I think the two abilities would stack.
i think he was saying a rogue that takes the ninja trick. the multiclass was ranger/rogue.
Considering the ninja trick says you can take it more than once, and it stacks, there shouldn't be any worry about it not stacking.
And even without that, there seem to be other feats and abilities with similar or even identical names, but as long as they are different types of options.. such as here, a class ability and an optional trick (which I see as feat equivalent), provided the wording doesn't indicate that they wouldn't stack, I see no reason why they can't.
How would I go about getting a Paizo response so when I bring it to pathfinder society game it is legal?
you bring the book and show it to anyone who questions it. it says that it stacks in the description of the ninja ability. it is quite within the rules. and if anyone brings up the sniper ability you can show them that untyped increases to anything in the game stack with each other, and there is no type associated with the sniper's range increase.