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Nope, IIRC when they used "update_kindle_%build_number%" naming template different Kindle models never had the exact same build number. The same build number for all still supported Kindle models on v5.x branch started somewhere around v5.7.x IIRC.
Not 100% sure but I think that in early days of Kindle Touch (= first model that was on v5.x branch of Kindle firmware) firmware updates weren't in form of a complete filesystem images but instead used a file patching mechanism similar to how things used to work in Kindle 2 and Kindle 3 days??
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