If I connect my new Wi-Fi 6E router with the ethernet cable to that router I have to buy, will I have all the benefits of the Wi-Fi 6E or not?

I have to upgrade my internet provider router, but the upgrade model support Wi-Fi 6, not the 6E.

If I connect my new Wi-Fi 6E router (another one I’ve bought recently) with the ethernet cable to that router I have to buy, will I have all the benefits of the Wi-Fi 6E or not?

Basically the question is about “lossless/upgradable Wi-Fi standard support”:

  1. Wi-Fi 6 (main router) –> Wi-Fi 6E (other router)
  2. Wi-Fi 6E (main router) –> Wi-Fi 6E (other router)

Which one? 1 or 2?