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As far as I know, a brown airport on the low en-route chart does not have an approach procedure but blue and green airports do. But what exactly are the differences between these colors?

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From the FAA Aeronautical Chart User's Guide:

Facilities in BLUE or GREEN have an approved Instrument Approach Procedure and/or RADAR MINIMA published in either the FAA Terminal Procedures Publication or the DoD FLIPs. Those in BLUE have an Instrument Approach Procedure and/or RADAR MINIMA published at least in the High Altitude DoD FLIPs. Facilities in BROWN do not have a published Instrument Procedure or RADAR MINIMA.

So the green ones are in the FAA TPP but not in the DoD High Altitude FLIPs.

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