Just curious as to why you are looking to swap the engine automatically.. Usually the engines on these cars are the strongest parts of the car. Other things will need to be replaced before the engine itself. (Assuming no mods)....
The Integra and Prelude are pretty similar cars....the Integra (especially the type R) is somewhat more primitive and harsh in its feel and driveability. The Prelude, while definitely being a "drivers" car, is more driver friendly, and is somewhat more refined in its ride....
The power in the Integra coupe or sedan is much less than the 5th gen Prelude. Very little power down low, but the higher you rev, the bigger the grin on your face!! Other than the type R Teg, the Prelude is considerably faster. I dont know the numbers off the top of my head.
Again..I wouldnt worry about swapping engines as the honda 4 cyls are strong as hell. If you want speed, compare the Type R to the Lude.
Either way...you cant lose...both cars are winners!!!