If there is something I really hate is when I'm coding is checking for every single color code so I can make my NTSC coded game into PAL60.
So I wrote a little window based program in Python with Tkinter that allows you to change all of them via one click, you just have to select your input file and you will have the PAL60 version in the same folder.
I set up my own columns, but you can change them if you think you found better matching pairs. There is a checkbox, if it's unchecked, it only searches for COLUBK, COLUPF, COLUP* and *color variables, this is the safe mode, as checked, it will change every single hexadecimal number, so if you have used a hexadecimal number anything besides the color codes, it will mess with your code, so be careful.
I added both the executable and the source code into to zip. The exe only works on 64bit Windows, the .py should run on every windows system if Python 3.7 is installed.