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not sure, but i believe your request is actually implemented in the current rack browser already.
if you look at the top-right there's a collection of tabs, one of which reads "Panel Selector On/Off". if activated, you can browse all available panel versions for that one module (when hovering your mouse over the desired module) and settle for the one you like most (or the one you're having) by clicking on the arrows. at least that's what i always do.
if a specific panel version is missing for the module in question you could just add another picture yourself to this single master entry and that way the database is not getting clogged up forever with countless versions of one and the same module.
just give it a try and see how it works for you;).....