Let me try to explain it this way:
Node-RED operates on Node.js which is based on the V8 Javascript engine.
Node-RED MCU Edition (or node-red-mcu) operates on the Moddable SDK which implements XS as Javascript engine.
The node-red-mcu-plugin eliminates the effort to bring node-red-mcu & the flows (at that stage deeply merged) on the MCU & modifies the editor to exchange with the connected MCU when the flows are running.
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