Colour between Premiere, After Effects & Export is different

The color capabilities and options between Ae and Pr are enough different that it is flipping hard at times to get them aligned. In my experience, the best advice for this comes on the Ae forum in reality.

You should be able to match them in "stock" Rec.709 workflows for most things. Going to HDR stuff ... gets tricksy-er. A lot. 

So to help, with the many variables here, we would need to have all the data. All media used, the specific versions of Pr/Ae, the hardware specifics, any effects used, and of course full details for any pic example on the settings in both Pr and Ae.

Sorry this can be so complicated, but until we get a more unified approach to color between the two apps, it's ... difficult.

And btw, Resolve also has major color handling differences between the Color page and it's composite app, the Fusion "page" ... I spend most of my computer time these days dealing with Resolve, as I teach pro colorists. And the differences between say your graphics in Fusion and the color page can drive ya nuts. Sigh.