Please make up your own minds as far as equivalencies regarding spectral lines of hydrogen and Earth bearing similarities. The Earth's spectroscopy provided doesn't include the Moon. The spectral line of hydrogen bears a similar construction to Earth's spectroscopy in placement and degrees.
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search webbtelescope spectroscopic analysis of three planets articles 24
Is this the website that you are talking about? http://webbtelescope.org/articles/24
The spectroscopic graph pictured there is of the chemical constituents of each planet's atmosphere. It doesn't have anything to do with the planet's orbital parameters. Jars of air from these three planets would have the same signature.