Poser has inextricably intertwined the shader with the textures. It's a pity.

This is why I built VSS. While VSS isn't finished, it does a credible job of dealing with this problem.

My usual problem is not the same as your post. You asked about swapping textures while keep shaders. Mine is swapping shaders while keeping textures.

To that end I built VSS. It keeps the shaders, sans textures, in a separate prop. You click a button to Synchronize the shaders, copying them onto a prop, while preserving the textures that are already there. Thus - I am able to tweak a skin shader over and over and copy that to a dozen material zones, while preserving the fact that those various zones have different texture files in them.

When I want to swap textures while keeping shaders, I use whatever mat-pose or mat collection the vendor supplied to load their texture+shader. This loads the textures in one click, but also loads undesirable shaders. Then I use VSS Synchronize again to re-apply my shader onto the figure while keeping the newly loaded textures.

Whenever I finally get around to finishing VSS, there will be a fast way to change textures alone, shaders alone, or both.

Meanwhile, it's free. See my signature. Not only does it make it easier for you to manage shaders, but it comes with some pretty good ones for you to use out of the box. Search the galleries for "VSS" to see examples of people using it. Some are merely good, and some are outstanding.

And there are a jillion posts about it in this forum.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)