Be careful if your library or application does not consider the option of having more than one area of use per CRS. You may lose some data.
... and be careful if you use PROJ with CRS with multiple area of use per CRS. It is not super ready for it. That's a major PITA to fully take into account. In the part of the code where pipelines to transform from CRS A to CRS B are computed, it will take into account only the first extent. Actually to fully take into account that complexity, we would have to also takes into account the polygonal description of area of uses, not just bounding boxes, another major complication. If people are interested in those advanced capabilities, investments will have to be done.
Even -- http://www.spatialys.com My software is free, but my time generally not.
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