When working with different template variants like HTML, Vue, or React, feature compatibility becomes a key factor in ensuring a smooth development process. Each framework has its own set of capabilities, syntax, and ecosystem, which may affect how certain features or components perform. For example, while an HTML template may be more straightforward and easily customizable, a Vue or React template might offer advanced reactivity and state management features. Compatibility issues may arise when trying to integrate specific features across these variants, like ensuring that assets or interactive elements behave consistently. As an example, if you're building a game-related site, such as one offering the Nulls Brawl PC version, you'll need to ensure that features like login systems or download buttons are properly implemented across all templates, regardless of the framework being used.

Direct inquiries: Since there is no compatibility matrix available, contacting the template provider (Keenthemes) directly may yield the most accurate information about feature specifics in the React variant.
Community and Documentation: Explore forums, user reviews, and detailed documentation that can also provide insight into what features are includedBuild Now GG or missing in React version of Metronic.
Custom implementation: If certain features like dark/light switches are missing in the React variant, consider the feasibility of custom implementation of these features. React's ecosystem and flexibility often allow integration of such features with additional development effort.