What has worked for me, although not necessarily ideal is to go into maya and ensure:
Unreal Aspect Ratio: 1.77,1 = Maya Camera: Camera Aperture 1.77,1 AND Film Aspect Raio 1.77
Unreal Camera: FOV: 90 = Maya Camera: Angle of View: 90
Camera Aperture is often a more precise balance that doesn’t have to match the Film Aspect Ratio. It’s not clear to me if there are other issues with this set up, but I would say for the use cases that required a close visual match this is reasonable.