Well, a 1.3 GB update is probably a complete full update, but you could have a partial full update of any size. It depends what they're updating. Full=no presumption of contents of a particular area. Incremental=presumption of contents of a particular area. The two big areas are /system and /vendor. If you have a friend with one of these (and the same current version software) you could do an md5sum on the partition.
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