It has nothing to do what is in the first line, the first line of code like this is referred to as a safety line, but you don't need G49 or G94 in there at all
You can either make you tool diameter bigger or smaller in the tool selection and reprocess and have a new program
Or use cutter comp which would be G41 and G42 depending if you are cutting left or right, and to cancel cutter comp you use a G40
In Gibbs you just have to turn Cutter Comp On and then you process, you can then make your tool adjustments in the tool offset page of your control