I suspect not. But why would you want to do that?Is there a way to simply download Catalina 10.15 and not 10.15.1?
A more general question: why did you upgrade in the first place? It is well known that for a new version of the Mac OS, it takes at least 2 releases to work out just about all of the major bugs, and a good amount of the minor ones. Also, there is always the issue of Third Party software compatibility.