Photoshop :: Making Two Copies Of A Photo Look The Same

I have a stock photo that I want to use that looks perfect except it is too small for what I wanted to use it for. I managed to aquire the same identicle image, only larger but the colors look totally different. Is there a quick and easy way (plugin or 3rd arty app even?) to make the second image's colors take on the exact same colors as the smaller copy? I really need to spend some time learning color correction, I know, but you'd think there'd be a one click solution for something like this.