Last I heard there were two kinds of sins: Venial and Mortal. I get the impression The Church would say if you have enabled abortion in any way, since we consider abortion to be murder, it would be the latter. So your levels of “seriousness” are distinctions without differences. Substitute the word “murder” for “abortion” in your post I am responding to, then clean up the grammar and you get this:
“Paying money to directly commit murder is more direct, and not as serious a sin as voting for a funding package which included the possibility of paying for murder. Actually having someone murdered or committing a murder is the most direct sin and results in excommunication.”