On 29 February 2024, the European Parliament approved the amendment of the eIDAS Regulation. The revision introduces new elements and a new EU Digital Identity Wallet, expected to be ready by the end of 2026. Even after the wallet is released, the numerous digital identity schemes operating within the Member States will continue to function for some time. The introduction of the new wallet and the coexistence of numerous digital identity schemes will pose challenges for service providers, who will need to adapt to support various means of identity, including the EU wallet, for their services. In response to this challenge, this study examines how to plan interoperability between eIDAS and existing frameworks. First, we organize the eIDAS components in a knowledge graph that encodes information through entities and their relations. While doing this, we highlight various design patterns and use a graph entity alignment method to map components of eIDAS and the Trust Over IP.