Abstract: It is questionable that whether virtual and actual synchronous generators with similar parameters could provide identical dynamic support to the power system. In order to analyze the differences, this paper introduced a MIMO-based analysis tool for modeling 2 integrated by various types of power- electronic-interfaced generators. The scalable tool can test modeling accuracy of each individual generator using transient stability simulation, and then coupled all generators/loads though the passive network, with the network transient included. During transient stability validation, we found that the VSG has the ability to accurately emulate SG’s dynamic responses, as expected, as long as the converter has a strong overloading limit, and the generation of active-power reference is properly designed. Yet in practice this could be hard to realize, considering that the current limit is usually slightly higher than 1.0, and thus the current controller tends to be easily saturated during severe voltage sags. For small- signal stability, VSG can emulate the SG’s low-frequency inertia response under small disturbances. But due to lack of stator-flux transient modeling, the high-frequency oscillation of VSG is completely deviated from that of SG.