What is the difference between Waterstop-RX 101 and Waterstop-RX 102?

Waterstop-RX 101 is 1" x 3/4" (25 mm x 20 mm) with a rectangular cross-section and comes in 100 ft. rolls, while Waterstop-RX 102 is 3/4" x 3/8" (19 mm x 10 mm) with a half-circle cross-section and comes in 200 ft. rolls.