Yes, they certainly look different, but when I look at them, I don’t consider the UE4 one being too bad of a result for 32 millisecond render. Although I am generally against tweaking, there’s a lot of parameters that can be tweaked currently, such as completely being able to disable realtime denoiser for RTGI, or reduce its strength and brute force it with more samples, but you’d end up with something that’s far from realtime unfortunately.
So if you want something to play with, there’s tons of it:
I’d do test myself, but unfortunately as I don’t have an RTX card, I’d probably not arrive at any meaningful results.