At first, you may think that all dinosaurs were the same. But they were not. Take a look at these feet. There are clear differences between them. The ones on the left have sharp claws. This dinosaur would have made a three-toed impression, for its fourth claw is tiny.
The one in the middle has three peg-like toes without pronounced claws. They would have made a broader impression.
The one on the right has a group of five toes all curved together. It would have made a simple blob-like footprint.