Likewise, if they're not in a corrosive atmosphere, they will not affect each other. One could argue that, even though a marine, or even a moist environment, would be worse, anywhere there is oxygen -- iron will rust, and contact with bronze will accelerate it. But this is a very slow process -- not quite a human lifetime, but at least, an adults' duration of practical interest.
'Course, if the items are one of the hundreds of types of steel, then the resistance to corrosion is likely greater, but it's hard to know how much. At any rate, try to wrap things that you won't need to use, for years at a time, with a oilcloth, or seal them in plastic, or something like that, while they're inside your safe -- it's just as much organization, and corrosion prevention.