I'm guessing that your car has stock 19lb injectors, at least most of them anyway
. The blue one could be a 24lb unit if it is a Ford or it could be a 19lb'er if it is another brand. Can you find a part # on it? That would help as most autoparts stores should be able to cross reference it.
I would not be too concerned with the light cracking on the "hat" of the other injector. As long as the hat is not real loose, it should be fine. I've run them like that, inspected them many miles later and all was okay.