My wife has a HP laptop from work that charges through USB-C. I have a Dell XPS from work that can charge by USB-C (because I have a dock for it which does that

My wife has a HP laptop from work that charges through USB-C. I have a Dell XPS from work that can charge by USB-C (because I have a dock for it which does that), but if I plug her charger in, it doesn't work. It's a mess.