Considering how many different oracle layers/applications have been created and how they don’t all deploy nodes the same way, I think it’s definitely a relevant distinction to be made. I am looking for sources in that it was requested that I make a more detailed explanation of an “oracle node” for an upcoming summary.
Especially in light of the Decentralized Oracle Network (DON) proposal: Research Summary: Chainlink 2.0: Next Steps in the Evolution of Decentralized Oracle Networks - Oracles and Data - Smart Contract Research Forum
The notion of “oracle nodes” will be more important to articulate as DONs become more ubiquitous.