This is the only difference? Really? Can't think of anything else?
First of Elon Musk is an engineer and programmer. Steve Saleen was a racer and mybe I'll give him designer, but certainly not an engineer.
Musk has a degree in physic. Saleen has a degree in business.
Musk founded 4 succesfull companies and is the largest shareholder of a fifth one.
Saleen founded a company that went bankrupt, went to be CEO of second company that went bankrupt and now he funded and is CEO of a company on the brink of bankruptcy.
Musk is now 43 year old. Saleen is 66 year old. At 28 Musk sold his first company, Zip2, for $300 million. This alone out-does all of Steve Saleen's entire business career. Then Musk started the first online payment service, Paypal, which got sold to ebay for $1.5 billion before Musk left. CEO of Tesla now worth north of $30 billion, CEO of SpaceX now woth $12 billion. Largest shareholder of SolarCity now worth $5 billion.
Elon Musk and Steve Saleen have nothing in common other than being both white males.