Apply Style variation to specific pages

According to the documentation on Style Variations, it would not appear so. The intent of Style Variations is to be “skins” for your theme and site, rather than for individual pages.

However, CSS can be used to apply different styles to specific pages: the <body> tag of each page has classes that can be used to identify pages, and custom classes can be added using the body_class filter.

add_filter( 'body_class', static function ( $classes ) {
    if ( ! sewd427356_style_variation_logic() ) {
        return $classes;
    }

    $classes[] = 'sewd427356-style-variation';

    return $classes;
} );
body.sewd427356-style-variation p {
    color: #f00;
}

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