That's not a huge difference and you are comparing Jeanty to a RB that ran a 4.66 forty at the Combine and was not known for his speed. Jeanty is a great back, but he's not likely to be a home run hitter in the NFL. Which is fine since RBs seldom get to use that speed or hit those home runs no matter how good they are. The exceptions are guys like Saquon and it's why although I think Jeanty is very good, I don't think he's in the class of Saquon.
So, sure, he's likely in the range of a Mark Ingram type. Probably better than Ingram but he's not Saquon or Barry Sanders. And the fact that he's only 5'8" and 203 Lbs. does mean that for him to be successful as the type of runner Ingram was, he is going to have to be an outlier. It think he is that outlier, but it is an issue.