They are exactly the same. Terminology was changed in version 2.4 and the release of the simplified UI. The old naming is still used in the manager UI.
Thanks for responding...What about the requirement to add a Tag? Can't get pass that requirement to deploy the LR.
Tag is not required. I know the UI is a bit confusing there. If you want to use tagging on your objects, “tag” is required while “scope” is optional. That’s what it’s trying to tell you there.
Replaying to you question: "I am confused about whether to deploy a Tier-0 Router or a Tier-0 Gateway."
Here is a nice introduction of the two new NSX-T 2.4 UI parts: Deploying NSX-T v2.4 for Enterprise PKS > Chapter: NSX-T v2.4 Management Interfaces
Simplified UI/API, Advanced UI/API