Can I use DOT 4 if it says DOT 3?

Excuse me, I'm just a bit confused here. Could you please clarify something for me? I've got some DOT 4 fluid, but the instructions are calling for DOT 3. I'm wondering if it's okay to use DOT 4 in place of DOT 3. Are they interchangeable, or would there be any potential issues or compatibility concerns if I did so? I'd really appreciate your help on this matter as I don't want to make any mistakes when it comes to my vehicle's maintenance.