Will the motor from an 03' 5.3l work in a 99 Tahoe?

[yooformula]

I have my old motor for sale and someone wanted to know if he could use it to replace his popped 5.7l from a 99'. I know they will swap into the 4.8l with just an ecu but I dont know what all would be needed for it to work in a 99' 5.7l.