How was it possible for Sailor Moon to be referenced in Codename: Sailor V?


I just read _Codename: Sailor V_ and there were many references to _Sailor
Moon_ (Usagi and the other guardians making cameos, etc.), in spite of the
former being created and published first. It was especially prominent towards
the end, but Usagi made an appearance pretty early on. I'm interested in
knowing what the publication history of _Codename: Sailor V_ was like. And if
any edits were made, what they were and when they happened. A timeline of
_Sailor V_ and _Sailor Moon_ might also be sufficient to answer the question,
if my assumption about edits is incorrect.




_Codename: Sailor V_ first appeared as a one-shot on August 3, 1991.  
The actual manga was then written pretty much simultaneously with the _Sailor
Moon_ manga, which started only a few months later (December 28, 1991) and
which was updated much more frequently.  
It even ended later (July 3, 1997) than the _Sailor Moon_ manga (February 3,
1997).  
That allowed for the cameos between the series.

Sources:  
[Codename: Sailor V
Wikipedia](https://en.wikipedia.org/wiki/Codename:_Sailor_V)  
[Sailor Moon Wikipedia](https://en.wikipedia.org/wiki/Sailor_Moon)  
[Sailor Moon Wiki](https://sailormoon.fandom.com/wiki/Codename:_Sailor_V)




_Codename: Sailor V_ first appeared as a one-shot on August 3, 1991.  
The actual manga was then written pretty much simultaneously with the _Sailor
Moon_ manga, which started only a few months later (December 28, 1991) and
which was updated much more frequently.  
It even ended later (July 3, 1997) than the _Sailor Moon_ manga (February 3,
1997).  
That allowed for the cameos between the series.

Sources:  
[Codename: Sailor V
Wikipedia](https://en.wikipedia.org/wiki/Codename:_Sailor_V)  
[Sailor Moon Wikipedia](https://en.wikipedia.org/wiki/Sailor_Moon)  
[Sailor Moon Wiki](https://sailormoon.fandom.com/wiki/Codename:_Sailor_V)

