All sea hurricanes were "war weary" -- that is they were almost all converted from existing hurricanes. As for "hurricats" being old, worn out planes, they weren't. They were leading edge at the time this took place ('40-'41), along with the Spitfire. They just had more hurricanes to turn into fleet defenders than they did Spitfires.
Most of the many hundreds of Sea Hurricanes had 8x .303 Browning MGs. Only a scant 60 "IIC"s were produced with 4x 20mm Hispano cannon. These were later on in the development. By this time there were also Martlets and whattayacall'ems, RN versions of the Hellcat and Wildcat.