Another thing to notice is that Pensacola had the entire mainmast tripod removed and replaced with a single tower during its refit at the Pearl Harbor Navy Yard in January, 1943 - this was the yard refit that repaired the damage received during the Battle of Tassafaronga off Guadalcanal on November 30th, 1942.
This is the ship photographed in October of 1943, with the tower addition visible aft.
It appears to me that the forward Mk.19 5" director has been replaced by a Mk.33 with a Mk.4 FD radar, but the rear Mk.19 is still in place. I can't be certain because of the grainy photo though.