Those are the four with water color variations...
Among Michigan City IN pieces, I don't have a breakdown on the count of the greenish water ones; the color difference isn't as great as in the other pieces.
Barnegat NJ - About the first 1000 have greenish water.
New London Ledge CT - About the first 2,000 have greenish water.
Minot's Ledge MA - more information at
www.harbourlights.com/modifications/pages/var_minots.htm Some other color changed pieces:
Round Island MI predominant color of bricks changed from brownish-red to pinkish red.
Beavertail RI - tower changed from peachy-tan to granite gray after 3,000 were produced.