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Can You Copy Shape Keys In Blender? [Solved]
Select the object to copy, then the object to copy into. Use this action and a new shape key will be added to the active object with the current mix of the first object. Transfer the active shape key from a different object regardless of its current influence. Select the object to copy, then the object to copy into.
Blender QuickTip: How to transfer Shape keys in Blender the easy way.
In this tutorial
Blender 2.8 Shape Key Transfer
How to transfer shape keys in Blender
How To Transfer Shape Keys From One Mesh To Another In Blender
This video