The TiVo has a different connectivity setup to the V6, the Ethernet is only used for streaming and the internet is in-built - whereas the V6 does both over the Ethernet/WiFi/homehub connection. I can't recall what the IP address on the TiVo relates to, but I suspect it's the inbuilt cablemodem. All meaning, you'd need to check the IP allocation in your router for a reliable check.
All TiVo & V6 boxes have numerous reset options via the "Clear and restart" menu, all of which are labelled as to what they clear.. only the lower options delete recordings, the "reset my box" ones are perfectly safe. Are those the ones you've tried?
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