Straight swap! 4 bolts hold the rad shroud on, and 3 bolts hold the fan to the shroud. Remove all the bolts, swap fans, do em all up again

Only thing you have to watch out for is if both fans are the same type, some dubs came with only a single speed fan and others had a 2 speed fan. Way you tell is to look at the fan plug wires, if there are 3 its a 2 speed jobber, if only 2 its a single speed.