Regarding radar, of couse I am only guessing as I don't have access to the bid documents, but since the tender originally requested for an existing vessel , I tend to think Navatia opted to offer a proven radar. If they had been allowed (from the beginning) to offer the Spy-7 as they are using in the F-110 most probably they had offered it.
Similarly about the propulsion plant. F-110 is using a CODLOG scheme (maybe ...AG?, not sure) pretty similar to that of the CSC (just change the R&R GT for a GE GT). But since F-110 was not an existing ship by then they probably quoted an existing CODAG system.
Edited to add:
The point beig that I guess Navantia placed their offer based on existing ship, even though the preliminary design of F-110 was ready. Actually F-110 project started (meaning getting Ok & funds to proceed) only a few months later than CSC. On the other hand, they passed the CDR a few months in advance than CSC and progress on the 1st unit is ahead of the CSC.
Seems we were writing at the same time, had not seen your previous note on CEAFAR radar, which is reasonable as they had just offered also the (same?) design for the RAN.