Does prestiging the shield in Trimps revert it to health?

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There is an upgrade (found from the rare map The Block, level 10; I found it while farming gems on another map) which causes the shield to grant block value instead of health. It's still possible to find shield prestige upgrades, and they make no mention of block value (only health). Will purchasing one of these upgrades (in this case, Supershield 2) cause my shield (currently a Shield III) to revert to health values?
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