Is it possible to change the bg color of visual selection and popup separately?

[lucaciccale]

I'm customizing Terafox and want different background colors for visual selection and popups. Both use the "sel0" key, so changing it to the regular Terafox background color makes my popup look good but makes visual mode highlighting not noticeable. Is there a way to separate them? Here is a pic of how I'd like it to look but without the visual mode problem