You can modify the map in small, indistinguishable ways to make it your own.

I'm not really sure that you can recreate a map so accurately that the CS people will notice so you might be safe there... but if you plan to exactly mimic a map, then you might be asking for trouble.

Keep in mind that nothing you do will likely bring the attention of the CS people, but it's a good idea if you plan on developing games to not start bad habits early.