You will not find it because the RRT is fitted with that gain builtin, it is actually 1.45. I can see your reply to my question on UDN. I will get back to you next week there as I don’t have UE4 front of me but basically, you need to increase scene-referred linear light values with that gain in Nuke and disable the Gamut Expansion and Blue Light Artifact Fix in UE4. With all those 3 tweaks, you should have a quite good matching. It will not be exact though but fine for practical purposes.
Cheers,
Thomas