It's unlikely a starter from a 1999 Chevy Malibu will work in a 2001 Pontiac Grand Am. While both are GM vehicles, there are significant variations in engines and transmissions across models and years. The starter's mounting points, bolt pattern, and electrical connections are likely different. Even if the engine size is the same, the starter itself might be a different design.
You should always check the part numbers to be absolutely sure. Use a reliable parts website (like AutoZone, Advance Auto Parts, etc.) and enter the year, make, model, and engine of *both* the Malibu and the Grand Am. Compare the starter part numbers. If they are different, they are not interchangeable.
