To ensure effective interoperability in electric vehicle (EV) wireless charging systems, a single ground transmitter must seamlessly interface with EV receivers that vary in power class, air gap, and circuit design, facilitating reliable and efficient charging. However, achieving optimal efficiency across different power levels, air gaps, and circuit configurations presents a significant design challenge. This study addresses this issue by exploring EV wireless charging systems configured with two distinct topologies: LCC-S and LCC-LCC. Using the transmitter coil dimensions specified in GB/T 38755.6 as a guideline, the research enhances transmission efficiency and optimizes system parameters by adjusting the resonant inductance of the transmitter and the system’s coupling coefficient. Two receiver units with different power ratings (11 kW and 22 kW), circuit topologies, and air gap settings are designed. The proposed interoperability approach for EV wireless charging systems is validated through simulation, confirming its feasibility.