Paul D. Ryan and Mike Simpson are from the same party
and agreed on 96
percent of votes in the 115th Congress (2017-18).
But they didn't always agree.
Out of 27 votes in the 115th Congress, they disagreed on 1 vote, including 1 major vote.
Paul D. Ryan was the Speaker of the House. The Speaker votes at his discretion.
Here is the vote they disagreed on
Correction (Nov. 15, 2019): This page originally included all votes on passage of a bill under the "Major Votes" category. It now only includes votes designated as major by ProPublica.