GM 3800 V6: 1990 LN3 swap for 2000 L36?

The mileage on my 1990 Bonneville is getting up there a ways, and my 2000 Bonneville is having electrical issues. How hard would it be to swap the L36 in the 2000 into the 1990? I know that L36 is not as tall (built for smaller spaces), but other than that, I don’t know how different the two engines really are. I also know that the LN3 has a 8.5:1 compression ratio, while the L36 has 94.1. The picture is of the LN3 currently in the 1990. Also, I would like to take the transmission from the 2000 and put it in the 1990 if possible.