Saliormoon ran from December 28, 1991 to February 3, 1997.
Sailor V is harder for me to pinpoint (I’d need more time than my work schedule morning break I’m on at the moment), but it was originally a one-off piece published August 3, 1991. I don’t know offhand when it became serialized, but it may have started April 1992. It ran until July 3, 1997.
I never really looked into these dates before. I’d read that she worked on the two series concurrently. But when you consider Sailor V is 16 chapters to Sailormoon’s 60 chapters (plus various short and long side stories), it looks like Sailor V took a back seat to Sailormoon. It also looks like the one-off spurred Sailormoon, but Naoko maybe wanted to continue Sailor V once Sailormoon got off the ground. (Just idle speculation on my part. I’m sure there are interviews out there with actual details.)
If I remember right, there are some cameo appearances, like Usagi and Naru walking by in the background in a chapter of Sailor V. I’ve also read that the events of Sailor V cannot fit into the timeline of Sailormoon.
It is interesting to consider Sailor Venus’s appearance (rough estimate without looking into it, maybe August 1992) was alongside Sailor V’s still being early on in its run (at best, maybe six chapters).