To merge already produced 3MX model the y do not need to be geolocated. They must however be in the exact same SRS. If your requirement is to progressively add new photo's to the same project you can either re-process the entire AT with your new images and then produce only the tiles that are affected by the dataset. Or, run the subsample independently and merge it with the initial block using the derived GCP (as described in the document)
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