Gateway <> Gateway IPSEC VPN is not officially supported. If you need to establish IPSEC VPN between two AWS environments then you can use TGW/VGW on one side and 3rd-party virtual appliance on the other side.
Can you expand more on the use case? As long as both tunnels are setup to be active/active it will provide HA and will work since the AWS side of the VPN will initiate an outgoing connection to the customer gateway (which can be a VGW or TGW). The VGW can only send traffic on one active tunnel at a time and so you would be limited to 1.25Gbps.
However, within AWS there are a number of options for connecting together a VPCs and TGWs (namely a native attachment within a region). Using VPN wouldn't be consider a best practice for such use case.
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