The increasing penetration of renewable energy sources (RES) introduces the risk of significant reduction in power systems rotating inertia, which might result in steeper frequency deviations during power imbalances. To mitigate this trend, faster frequency stabilization mechanisms are needed and required, such as the known Fast Frequency Response (FFR) function. However, the development of Grid-Forming Inverters (GFMI) technology, which can emulate, among other aspects, the inertial response characteristics of traditional synchronous machines, presents a potential alternative to the FFR function. This paper investigates the interaction between the growing GFMI technology and the existing FFR function, evaluating whether their coexistence as combined deployment offers cooperative benefits or rather introducing operational complexities without major benefit that could be avoided. The technical and practical implications of integrating both technologies on a Wind Power Plant (WPP) are assessed through simulation-based analysis, aiming to inform future grid stability strategies and derive possible recommendations to the industry.