You can move an app to another App Service plan, as long as the source plan and the target plan are in the same resource group and geographical region.
The region in which your app runs is the region of the App Service plan it's in. However, you cannot change an App Service plan's region.
References: https://docs.microsoft.com/en-us/azure/app-service/app-service-plan-manage

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Explanation/Reference:
https://docs.microsoft.com/en-us/azure/backup/backup-azure-restore-windows-server

Explanation

Box 1: vNET6 only
Box 2: Modify the address space
The virtual networks you peer must have non-overlapping IP address spaces.
References:
https://docs.microsoft.com/en-us/azure/virtual-network/virtual-network-manage-peering#requirements-and-const

Explanation

Explanation
The Azure Site Recovery service contributes to your disaster recovery strategy by managing and orchestrating replication, failover, and failback of on-premises machines and Azure virtual machines (VMs).

Reference:
https://docs.microsoft.com/en-us/azure/site-recovery/azure-to-azure-quickstart
https://docs.microsoft.com/en-us/azure/site-recovery/azure-to-azure-tutorial-enable-replication