The difference between 158 and 194: 194 has a longer life and slightly higher current draw (0.27 vs 0.24).
The LED lights that you put in, draw even less, so no, that didn't 'kill' the CMS. But LED lights are polarity sensitive, ie; they only work when the correct polarity is applied. If you find one that doesn't work, pull it out and rotate the base 180° and reinsert.