Apply a page setup to all layouts in the drawing

I would like a routine that will determine if 'Page Setup A' is in the drawing and if so, apply 'Page Setup B' to all all layouts within the drawing. I would like to have it run upon drawing open in the ACAD.lsp

Does anybody have something like this.

Basically we've changed our master page setup names, and now when a user switches to modelspace then back to paperspace the layout loses its configuration.

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