The only one I know is the one from Cundco.de that you may also find on spielematerial.de but you already have that one, right?
I'm afraid yhe light brown figure is the light brown teacher/meeple you already have (the same as on cundco.de):https://www.spielematerial.de/en/games/carcassonne/transparent-meeples.htmlThe other phantoms on sielmateriela.de are here (no light brown):https://www.spielematerial.de/en/games/carcassonne/transparente-meeples-17889.html
Do not overthink it.
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