Again, nothing in what the programmer/artist said suggests Ralph and Christopher were the same person.
"Ralph C. Belmondo's 'C' was Christopher?"
"Yes, although I don't know whether it was written in the official data."
Nobody said Ralph and Christopher were the same person, they said Ralph's middle initial stood for Christopher. One of our presidents was John Quincy Adams; that doesn't mean John Adams and Quincy Adams are the same person -- his name's not even Quincy Adams, it's John Adams (with Quincy as his second given name). Even in the original Japanese text that's what it appears is all he is saying.
The descriptions of the two games (CV3 and Adventure) are nearly identical, granted. And while I am certain the series got retconned to match IGA's story-telling abilities, it does say Trevor fought Dracula more than 100 years before Simon and that Christopher fought Dracula 100 years before Simon, if one is to believe that Trevor actually lived 200 years before Simon. If Dracula was resurrected before he actually became a demon and was still a devil worshiper or sorcerer, then the 100-year rule wouldn't apply to him just yet. For all we know, Dracula never actually died. Trevor lopped off his head and it continued to move around, then turned into a multi-headed creature. Was that really Dracula? The dude was a powerful sorcerer that had control over various demons and could summon Pazuzu. If he was dead, how did he summon Pazuzu? So in that regard, I think IGA might have taken a bit of a cop-out and would have done better to put Christopher and Trevor closer together. But as it is, "100 years ago" and "more than 100 years ago" are not the same thing and thus Christopher still fits into the timeline as an individual.