Rescale a control relative to other UI elements within the same container?

I'm working on a game where I've made a special sort of texture button that I want to use in two different places, but in each place the button is supposed to be of different size relative to the other UI elements within its container. Since placing it in a container removes any control over it's individual scale, I'm wondering how I'm supposed to achieve this? If the answer is that I just need to make a bigger and smaller version of the texture, then I'd preferably avoid that since I actually have a large set of different textures that may be used for different instances of the button so in that case I'd have to include a bunch of extra duplicate images just to get differently-sized versions of each. But maybe that's how you're supposed to do it?