Er, the Skyline/Pintara separation was just cynical marketing, much like the 350Z/Skyline issue now. At least Toyota doesn't call its' 4 Cylinder Camry a different car to its V6.
You're comparing a 180SX to a 240SX? They weren't even sold in the same market - they were different names for the same car (except engine) in different market.
If you think the R32 and the S13 and the Cefiro look the same that's up to you I guess.
For those of us who care, we are bitterly disappointed that not only has the styling become homogenised, but the engine is the same, and the chassis is the same, and the engine is the same! Rotating a door handle doesn't impress us, sorry. Very disappointing for flagship models of a manufacturer.