The photo shoot was exciting! One caterpillar was immobile and the other an explorer. Both caterpillars pupated within 48 hours (and to begin with were green). After 3 days, one had lost its green color, fading to a brownish tan. Both color variations are common and depend on where the caterpillar has chosen to pupate.
Cabbage White butterflies are non-native to Washington and they prefer disrupted areas, compared to native butterflies which do not choose to lay eggs in most people's vegetable gardens.