The letter כ has two prononciations. It's either pronounced exactly like ק, or exactly like ח. Without niqqud (those little dots people never use) you can't really tell which pronounciation it is, sorta like the english letter C, you just have to know.
Basically, to answer your question, they're pronounced the same.
In case you haven't gotten this sorted out yet... if you're on a Mac, go to "System Preferences," and click "Keyboard." Once you're on that page, click "Input Sources" and then look for a + sign. Click that and a list of languages will come up. Choose Hebrew and click "Add." The instructions for switching between keyboards should show up when you click "Shortcuts" and then "Input Sources."
Edit: If you're using Windows, I'm sorry, but I can't help you there.
Check out the Welcome page for the Hebrew course: https://www.duolingo.com/comment/16251269. If you scroll down to the part that talks about keyboard stickers, you'll see how to download a Hebrew keyboard (different instructions depending on if you have a Windows or Mac computer). I'd also highly recommend you purchase a Hebrew keyboard cover. I bought mine on Amazon for $6 and it is a HUGE help. Hope that helps ya!