In Operation Javier, from TDC, the zombies were forced into the V-Act proccess, although they havn't fully mutated into crimson heads.
I have a theory for the presence of CH only in RE1:
The zombies in the Arklay facilities (created by the outbreak Marcus caused) are probably creations of Marcus' version of the T-virus.
That version of the virus was stolen by Birkin and Wesker, who maximized it's potential. This means that Birkin's version of the virus probably creates stronger zombies and monsters. This was the virus that caused the outbreak in Raccoon City and, possibly, most of the further outbreaks.
The version of the virus implied in Rockfort Island was probably not updated, as Alfred didn't care much about research, and so, assuming the virus that created the outbreak was the virus stored in their labs, it's possible that this was still an old version, creating weaker zombies. This version was probably the same in the Anctartic base, maybe it had actually been imported from there.
The Arklay's could be the only version which caused the V-Act process: The ones in CV were older and Birkin's had lost that ability. The zombies in RE0 had been infected too recently, and hadn't been in contact with the virus long enough to enable the V-Act process. But it eventually happens, as Wesker later observes (in REUC, begginings scenario). The prototype CH had possibly been created by a rare mutation, and Marcus later inserted that mutation in the virus' characteristics. However, that characteristic might had been eliminated by Birkin, who was foccused in creating a successful Tyrant. Later development of the virus might have reitroduced the V-Act process, as observed in Operation Javier.
