Is the hood from a 98 pontiac sunfire gt compatible with of 99 coupe?

No, a 1998 Pontiac Sunfire GT hood is not directly compatible with a 1999 Pontiac Sunfire coupe. While they are very similar cars, there were subtle body changes between the model years that affect the hood's fitment. You'll likely find differences in the hood's shape, mounting points, and possibly even the length.