I've been learning z80 ASM for quite some time now, and since I bought the TI-84+ CE, I've also learned about the "new" ez80 CPU. I'm not gonna consider myself to be an analyzer for a new CPU, but from what I have read in the forums, the ez80 CPU is supposed to be much faster (just by a comparison in clock speeds). The question is whether writing z80 ASM is relatively the same as writing ez80 ASM.

I know that there are a few new opcodes and instructions for the CPU, but is it necessary to make another ASM tutorial targeted specifically for ez80, or is a simple change in some code enough to fit the new CPU?

Writing eZ80 Asm is, indeed very similar. I am new to it, but was able to relatively simply convert a TI-84 Plus C Silver Edition password program from Z80 to eZ80 Asm. There is a new include file for the TI-84 Plus CE, and bcalls are now calls. The CPU now operates on registers in 24-bit mode, which takes some getting used to. The last main difference is that we cannot program apps yet, since TI has not released a signing key.

There is no need to make an entire Asm tutorial just for the eZ80. In addition, there is already eZ80 documentation.