Hello, I do not understand what you want to say with "if you tell me how they make the letters have that greenish color", you can pick the color in any software and try until you can get near color. For print it will be more dificult, and maybe you must do some print proofs until you can get near color.
For near font, you only have two options, looking for a similar one in any font web with search option from picture, or the more acuate, if you do it by yourself letter by letter, but it take more time. You can download a fonts software too and make your own font too.
Regards.