Two different fires in Brooklyn and the Bronx yesterday killed four people and injured three more. Both fires occurred relatively early Saturday morning. The first was reported about 7 a.m. and was on the second floor of a two-story house in Bensonhurst. The occupants were all immigrants from Guatemala. It took firefighters almost 40 minutes to bring the blaze under control, at which point three of the residents had succumbed to smoke inhalation. Another was......