I should also mention that modding might require root access on Android and that there are risks involved. Another point is to check if Pixel King allows mods in the first place. If it does, then there might be official support, but likely not. Most game mods are user-created.
If you are looking for specific versions or updated community variations, these platforms also host XML configs: pixel king xml file download link
Since I cannot provide a specific live link without knowing exactly which Pixel King you are after, here is a template to help you craft your own XML file if you are truly stuck. I should also mention that modding might require