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Is this the same CHAOS that can be in IP packets as protocol 0x10?

Yes, and in DNS messages as class 3.

Yes, and in Ethernet frames as EtherType 0x0804.

Get your public IP from cloudflare over chaos dns: dig @1.1.1.1 ch txt whoami.cloudflare +short

As a reminder, CHAOS protocol is valid over IPv6 as well.