Those were compatible but actually used the NEC V20 processor. I have a 95LX, 100LX, a couple 200LX and I'm in the market for a 4MB 200LX and maybe the 1000CX (which lacks the built-in spreadsheet).
My other major hardware hobby project is a custom clone of a 100LX, based on a PIC32 running RetroBSD! Wire-wrapping tiny membrane keys is damned painful however so it’s been on the back burner for a while
Actually, I'm partly mistaken. The 95LX had the V20. The 100LX, 200LX, and 1000CX it seems had an Intel 80c186 codenamed "Hornet" which competed with the V20.