Copy/paste feature using editor widget — How does ExB determine what fields to match/copy?

[Bud]

AGOL hosted feature layers; Experience Builder; editor widget

When copying/pasting a feature from Layer1 to Layer2, how does ExB determine what fields to match/copy?

1. I assume it's matching fields that have exactly the same name.
2. Where does the list of fields to copy come from?
   1. Does the list of fields come from the AGOL hosted feature layer, the web map, the web map form configuration, the layer in Experience Builder, or the list of fields in the editor widget?
   2. True field names or field aliases? I assume true field names.
   3. If fields are excluded in the editor widget, do they not get copied/pasted?