This is an interesting thing to pursue.I identified the political party affiliation by the vote of the top 4%. You identified it by the donations of the top 1%. I believe the top 1% is the group that is much more significant because of the political and economic power they have over everyone else including the top 2-4%. They are at the heart of the inequality problem the whole world is experiencing especially America.No, not hard data, but I'm sure it could be found. Just a general collection of loose facts I've collected as a political observer over the years.
Money definitely indicates the amount of political power exerted by Democratic or Republican supporting individuals, corporations and PAC's. It doesn't exactly correlation with the initial question because some wealthy individuals don't seem to be large political contributors. Warren Buffet comes to mind. He supported Hillary in 2016 but didn't give that much money to her. There are probably other examples. Bill Gates seems to be more of a true philanthropist than someone wanting to exert political power.
Here is an interesting web site for doing this kind of research.
Data on Campaign Finance, Super PACs, Industries, and Lobbying
Their description indicates they are unbiased. I would have to check that but it seems to be the case.
Our Vision and Mission: Inform, Empower & Advocate
Nonpartisan, independent and nonprofit, the Center for Responsive Politics is the nation's premier research group tracking money in U.S. politics and its effect on elections and public policy. OUR VISION is for Americans to be empowered by access to clear and unbiased information about money’s role in politics and policy and to use that knowledge to strengthen our democracy. OUR MISSION is to produce and disseminate peerless data and analysis on money in politics to inform and engage Americans, champion transparency, and expose disproportionate or undue influence on public policy.