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<https://azure.microsoft.com/en-in/resources/knowledge-center/which-regions-correspond-to-zone-1-zone-2/>

It’s nice of Microsoft not to include that :disappointed:  Pravin’s link doesn’t mention Zone 4 either.
Is there a different price record for Zones 1, 2, 3 and 4? Looks like Zones 1-4 have the same pricing, so maybe use this logic: if it’s a region in “Germany Zone 1” or “US Gov Zone 1" then use those prices, else use the other price.

Yeah Zone 4 isn't there which is odd, but the pricing across zones (1,2,3,4) is still all the same.