Hey! The different colors are due to color management and file type. In Blender it’s being displayed as a full 32 bit EXR, whereas you may have exported it as a png. Also, different programs display 32 bit images differently due to different color management, so I wouldn’t worry about it just yet if you’re keeping it all in Blender. This video covers that a bit: https://cgcookie.com/lesson/bit-depth-and-compression
The Eevee preview looks great to me, except the area near the back may be flipped. I’d have to look at the file to see for sure, but the rest of it looks totally normal.