NeoVim from Terminal vs. NeoVim from Tmux - different colors

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See title. Launching neovim from a standard terminal session loads it with the TokyoNight or TokyoNight-Day colorscheme. Launching neovim from Tmux however, loads with different colors all together.

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Upon further testing,
It seems that, inside of Tmux, neovim will match the system setting active when tmux was first started. Still, the colors are slightly different. See the screenshots as examples.

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Note: when using Default colorscheme, none of the above errors occur- in fact nvim will change to match system setting at any point.

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Note: this is becoming a non-issue as I move to just use tokyonight-storm, always. However, this can be switched by setting vim.o.background = "light"

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See theme.sh by Lemnos.
See catppuccin/nvim - includes tmux tutorial.

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Looking again at https://github.com/f-person/auto-dark-mode.nvim
This should work on Fedora as GNOME does indeed implement freedesktop.

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Auto Dark Mode does indeed work. Now just need to correct the color of tmux.