I'd suspect maybe a different profile treatment in one than the other. As a quick test try resetting develop settings and see if the images look the same. Helps to narrow down problem.
I reset the both of them, the one in Lightroom Classic seems to be brighter/white tones. I might import another photo into both CC and classic and see if the same issue persists.
I'm thinking it might be due to the lightroom CC file being a jpeg and Classic being a raw file.
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Amanda, the short course: RAW and jpg are two entirely different animals. The jpg already has a color-space and gamma curves applied; with the RAW that only happens in post-processing. What your settings apply to your RAW might be different than your jpg. This is almost certainly the cause of your differences. A good start would be to search RAWS vs jpg - others here might have a good first source to suggest.