Seamlessly combine two pictures keeping the original colors of the first one.

Hey guys,

I wanna combine two pictures into one by blending the edges.

The auto-blend layers does exactly that with good results except by one thing: in order to seamlessly blend the edges, it changes the color of BOTH images.

But I need the first image to keep its original color. And I want only the second image to have its color changed in order to match the first one.

How could I accomplish it in Photoshop? Thank you.