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The only difference between web.config files on multiple WFE servers.

...is the name of the policyFile located in the C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\config directory.

The individual wss_custom_wss_minimaltrust_GUID.config files will have different ending GUIDs, like this:

wss_custom_wss_minimaltrust_1fed96fb-db74-4076-9a48-d8a73f8a9b9f.config
wss_custom_wss_minimaltrust_520cb066-1535-4126-8551-3324419c025c.config
wss_custom_wss_minimaltrust_16cea51a-9c26-4dd2-bda5-0a0695605390.config