I'm not really positive, but I would think that 1 lb of dried beans, once properly soaked, would equal 2 (15 oz) cans of beans. Maybe more. Hopefully others with more dried bean experience will chime in.
Even if you're off a bit, you should be fine. My original recipe was 2 cans of beans and I use 3 cans now for a single recipe, just to stretch it and make more servings. I don't notice a real difference in overall taste with more or less beans, just more or less beans.
18.5", 22.5" OTS
Large BGE (chambersuac's)
The Fiery Furnace (chambersuac's)
Big JT's Smokin' BBQ Competition Team