Learning is good
I spent a couple years on AutomotiveForums back when I got my first H body, my 90 Olds 88. I found LeSabreT after another member at AF gave me the link for the site after I posted a want ad for a new car in which to drop my engine and tranny into (I wrecked my olds with only 45k on the odo :( ). Soo.... yeah. I can pull Olds and Buick H/C cars apart in my sleep so I figured I could learn about their Bonnie cousin.
With as many C and H body cars as I've had I'd figure I would know a good deal to chip in, at least on the powertrain issues as, like you said, they are identical.
Ya know, if I had enough spare cars laying around I've always wanted to "kit bash" a few together to see what happens. I'd start off with an Olds 88 FE3 coupe, put the front end of a LeSabre onto it (I LOOOVE the flip forward hood), the body kit of an SSE, and the interior would have to have SSE leather buckets and a T Type center console shift... not sure on how I would do the dash setup as I like both the Olds and Buick versions. Not a big fan of the huge Bonnie dash... but If I started with an Olds I'd prolly leave the Olds dash in... but swap in an Olds Touring Sedan instrument cluster as it has lots of extra gauges.
And then paint it all black. Man that would be wicked sweet, assuming all the parts would actually match up on the unibody frame with minimal work via sawzall and welder.