Hi Ken,
Almost the same.
The only difference is net port will be used on a subckt which is for spice simultion models https://beta.easyeda.com/Doc/Tutorial/spiceSimulation.htm#2.Fromasubcircuitinschematicform .
As Dillon says, the net port is used when creating a schematic for a spice subckt but you can also use it anywhere in a schematic to help indicate things like an off page connection.
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