Sure, but he surely wasn't the one who had to create the skull itself, so he wouldn't need to know what species it was. If you really want to ask someone, you might as well check the credits to see who made the background models, which is eaiser said then done.
I agree that it does look like one, but let's not forget that Heterodontosaurus isn't the only heterodontosaurid. There's also Fruitadens, Pegomastax, Abrictosaurus, and more (I know that the first two were described after 1993, but I just needed some examples). How can you say with certainty that it's a Heterodontosaurus and not some other member of the family?
I know. Even so, the people who built Jurassic Park clearly weren't paleontologists themselves. I'm not sure they would know which species of heterodontosaurid the skull came from. They just put it there because they liked its appearance. Just because Heterodontosaurus is the most famous doesn't negate the fact that it could still be another member of its family.
Currently, I've noticed you've continually tried to add one of your pictures into the Ammonite page, despite the fact that other users had deleted it. You need to stop doing that. If other people don't think your edits work, then don't keep adding them in. This is technically considered edit warring. I've seen from your history you have a habit of doing this, and this needs to stop.
Also, I hate to be harsh, but don't just reply with "Sorry" or "I promise", because I've seen you say those words over and over again and then continue with what you did before you said that. If you truly are sorry, you won't do them again, period. If you want people to believe you really are sorry, then show us, and not make empty promises.