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Re:WhatsApp – Security of End-to-End Encrypted Backups [pdf] by pgalvin on Friday September 10, 2021 @04:24PM (#28486484)
https://wabetainfo.com/how-to-migrate-your-chat-history-from...

This is possible now (in one direction, so far).

Re:WhatsApp – Security of End-to-End Encrypted Backups [pdf] by blue_rog on Saturday September 11, 2021 @12:34AM (#28489450)
Slight Nitpick: This is only available for Apple to Samsung devices.

However,

> Unfortunately, it’s still not possible to migrate your chat history [from iOS] to a different Android phone, but WhatsApp is planning this in the future. It’s also not possible to migrate your chat history from Android to iOS right now.