3ds Max :: Rendering Same Scene Several Times - Material Replacement

I'm working with a procedure to render the same scene (same camera position, same light, same lens, same output size, etc) several times due material change. The number of renderings of the same object may easily reach thousands because the scene objects may receive hundreds of different materials at the same time.

Due the scale and repetition of this render process I was wondering if there is a way to pre-render what doesn't change from render to render to try to speed up the process as much as I can. The ideal solution is to do the next Render by reusing all the calculations made previously (even if I have to save a temporary render info - not sure this is even possible inside 3ds Max).

The ideal world would be having a baked max file waiting just for the material replacements and quickly generate the rendered image as fast as possible.

I know some different material properties may affect light and shadows but I think 3ds Max already separate this Render step.

My aim is to automate this process reducing the overall rendering time without wasting resources to recalculate what haven't changed.