Paul, who also worked on the modeling team for the Star Wars prequels, did a great job with his team to effectively recreate the classic ships and update them with even more details to fit the modern look and feel of Rogue One.
The visual connections between Rogue One and the original Star Wars trilogy were many.
For the Star Destroyers in particular, ILM used larger miniature models than in the original Star Wars and added new pieces from the same modeling kits.
So if you watched Rogue One and felt as if the Star Destroyers and other classic vehicles were the same models that you saw in the original trilogy, it’s because in many ways, they were.
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'Rogue One: A Star Wars Story' - Rebuilding Classic Ships & Vehicles