Apple ID change
I’m getting a new iPad mini and I want to transfer my recent data to the new one with a fresh Apple ID
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Transfer the content
Transfer content from an iPhone, iPad, or iPod touch to a new device.
Quick Start to transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch.
Set up your iPhone, iPad, or iPod touch - Apple Support
Use iCloud to transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch
You can try setting up Family Sharing between the IDs if you want to be able to share purchases made with the IDs.