Well, the player names in the raid window are populated by hard coding. So the window name would have to remain, "Raid" and the internal structure would have to be the same as well.
I've never tried to clone a window in attempts that the game would do the same changes to both windows since they have the same node path. Also if you make the window the same name, it may do some compatibility checks and warn the user that their Raid window is not working properly(if parts are missing).
Since I am unsure about this... I would have personally stuck with my original suggestion as the internal structure of the custom window doesn't matter while a clone would have to be exact.
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