I believe that the Platinum 512Ke and Plus came about after time as the SE, probably because they run out of one plastic and used the other.

Funny, the board CumpuNerd sold me to fix my SE\30 is a socketed board, while the board it is replacing is not socketed. It does have an 80Meg Drive. The older SE & SE\30s (No HD I think) had a Hamster cage fan while the newer ones have that typical PC Fan.

The older SEs also had either a Resistor one had to cut/solder for various memory configurations while the newer ones had a jumper. Here's some SE webpages which covers this and other things about the SE.

http://www.hardwaresecrets.com/printpage/Inside-the-Macintosh-SE/1724

http://www.ccadams.org/se/ram.html