Gameplay-camera replays are 60fps just like during actual gameplay. The wide swooping replay camera angles with the added motion blur and DoF target 60fps on PS4Pro and 30fps on PS4. The cinematic camera angles have a pretty wide field of view and can sit high up so it is rendering more on screen, plus with the per object motion blur and depth of field effects that will be more demanding to warrant the framerate cut in half on regular PS4.
Comparing gameplay to replay of the same section of the track, there aren't really any graphical improvements in replay mode.
Comparing gameplay to replay of the same section of the track, there aren't really any graphical improvements in replay mode.