Find strings in multiple files and replace them

Hello,
I would like to know how could I find strings in multiple files which strings are stored in a txt file and rewrite them in all files.
For example:
There are 2 files in C:\temp: Colors1.txt, Colors2.txt

Colors1.txt with these strings:
red
green
blue
purple

Colors2.txt with these strings:
yellow
red
brown
purple

And I have an other „find.txt” file with the strings which I would like to find and rename them to the 2nd coloumn:

red red_good
purple purple_good

I should get the following results:
Colors1.txt:
red_good
green
blue
purple_good

Colors2.txt:
yellow
red_good
brown
purple_good

Thanks in advance!
iDrew