It's been a while since I've played with groove templates - here's how I think Logic handles this, and it aint pretty. Wish list item, I'm sure - to make groove templates importable.
You can't copy the templates from project to project, rather you need to save a project with desired groove templates (make sure you keep the reference file) as a project template and start a new project from said template. The manual recommends putting all the groove templates in a folder before you save.
So, if this is all correct (someone feel free to correct me), what you need to do is get his project, delete everything except groove templates, save it as a project template, load it, transfer all your stuff from your project...... Wow - could be a lot of work.
Easier idea (perhaps?) - copy his source tracks that he created his templates from and create your own - it's really pretty easy.
HTH