Colours differ in V4

I am migrating to v4, but the custom colour I registered to be the primary for the panel looks a lot darker now and no longer matches the brand.

FilamentColor::register([
    'primary' => '#FC9222',
    'secondary' => '#6D8EA0',
]);

FilamentColor::register([
    'primary' => '#FC9222',
    'secondary' => '#6D8EA0',
]);

Any ideas on how to fix it? Ideally the button colour could also go back to being white in light mode as well.