I don't know why specifically they added more holes, but look at the conning tower in the b/w picture compared to the one on the model. IF they are both USS Gato it would be after a major refit. I would not be surprised though. Some Gato boats were still in service as radar pickets off Vietnam in the mid 60's and Gato herself wasn't struck from the Naval Register until 1960. That is why you see so much variation in undated pictures of the class.
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