The only way I've seen the difference is in the fact you don't have to sacrifice a chip.
Zero doesn't die. Well, he does, but he just comes back. And again. And again.
And yes...'Dennoujuu' would've been rather confusing. Plus it probably couldn't exceed 8 characters or something. (Explains 'SerchMan', anyway.)
(You're lucky you've gotten it. I have to wait until tomorrow...)