You forgot to mention the K7 & K75 Athlon cores that had no on-die cache, they were using the slot A cache at 1/2, 1/2.5 or 1/3 core speed.
For all I care, the MP and the mobile Athlon 4 cores are both based on the Palomino, making them special but by no mean unique cores. The Athlon 4 is optimised for energy saving and lower core temp and the MP went through additional testing, so it's certified for SMP use and comes with unlocked multipliers.
The Spitfire is the first Duron core, based on the Thunderbird core, the Morgan is the second Duron core, based on the Palomino core.
Both of them are "limited" to a 100MHz FSB ( I managed to run a Morgan AHHAA @ 7.5 x 133 and a AHLCA @ 7.0 x 166 ) and come with only 64K L2 cache.
Fok Speling Misstake