Is this possible?

Say I have an Arch + Design, a Composite Layer in Diffuse and another in Bump. In each Composite Layer I have two layers each. So in total, two Diffuse Bitmaps, two Bump Bitmaps.

Is it possible that I can constrain the parameters of those four bitmaps together so that if I change the offset or tiling on one, all four change?

Note that they need different textures loaded in being different layers and different types of maps, so instancing doesn’t work. There any other way to selectively constrain, or at least have it so that the textures at least can be different?

Thanks for any responses.

Open curve editor. Expand and find the material and paramerter you want to link, right click and choose Assign Controller, set it to what you want, eg bezier float. Now right click and choose Copy. Find the parameter you want to link to, select and right click, choose Paste, paste as Instance. The two should now be linked.
You could also do it with Parameter Wiring and create expressions.