Widget compatibility with other watch models

Sorry in case I made a mistake but I have serious doubts about one thing and I have no idea about Monkey C or programming. My question is the following:

I have a Fenix 6x. I am interesting in a widget on the Garmin iq store that is available for Fenix 7x. I tried contact the developer to propose him the possibility to make it available for my  watch model without any success, but I realize that the program code is available at Github.

Make the app to work in my 6x is as easy to download the program from Github, open the project on the VS and change the model compatibility to 6x? or it require additional programming work?

Thanks in advance to your answers.