This has caused me some huge setbacks not being able to do compositing in post because the camera shake is different in each render. If Epic want to push the software more toward cinematics they really need to address these issues.
Another one being wind effects. A lot of time based materials use the time node which always starts its count when the render starts, so unless you always render from the same frame, it’ll have a different result each time.
Epic needs to introduce a method where the time node is synchronised to the sequencer position, you can manually do it by swapping it for a collection parameter and keyframe that parameter in the sequencer but I couldn’t get it to work for wind on megascans trees. Camera shake seems to be even worse, with the results just being random each time. Hopefully one day they’ll address this.
I’ll be looking at doing all camera shake in post if possible to avoid this issue in future.