One rule to observe, is that the Policy Server version should always be at or higher than any of the supporting components ~ i.e. Admin UI, Access Gateway (Proxy) server or Web Agents.
However, as a best practice, all SSO components should be at the same version, to assure that all features and functions are fully supported. Of course in the case of the Web Agents, which are still at 12.52, it would be best to assure that the most recent patch versions are applied.
Not knowing the reason for the question, I would suggest that it would be worth the effort in working through the issues in upgrading the Admin UI to the same version as the Policy Server (12.7 ~ sp.x)
Kirk