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I believe they are both the same. Batteria for coastal defense doesn't have a precise meaning. It could be anything. The Australian official states that 26 coastal defense guns were captured (To Benghazi p. 199). Prima offensive britannica states the costal defense was a battery of 120mm and two batteries of 75/27-06 c.a. If the c.a. were 8 guns, then sixteen 120mm comes close.
Montanari is also the newer work, something that is a tie breaker for me.