Does the PRC Think They Are the Only True Church?

Question I have been trying to find out more about the Protestant Reformed Church, in particular, what the difference is between the CRC and the PRC. Is the fundamental difference the idea of grace, common or elect? At one time I remember hearing something about how the CRC to the PRC are the unbelievers? Is that too harsh or not? Or am I way wrong, and miss-heard something? I guess I have lots of friends in the PRC from Dordt and am wondering where we differ and where we stand together?...