Recommendations

Both are dramas based on detective themes
Both have murder mysteries
Both have great story telling
The story pacing and the action scenes are great

Both are dramas based on detective themes
Both have murder mysteries
Both have great story telling
The story pacing and the action scenes are great

Both are dramas based on detective themes
Both have murder mysteries
Both have great story telling
The story pacing and the action scenes are great

Both are dramas based on detective themes
Both have murder mysteries
Both have great story telling
The story pacing and the action scenes are great

Both have the same Directors, Producer, and Costume Designer. You can see some of the casts of The Double in Perfect Match (Wang Xing Yue, Liu Xie Ning, Liang Yong Qi, Zhao Qing, Pan You Cheng, etc).
The Double is more about revenge and conspiracies, while Perfect Match is about the Li sisters finding their partners. YES, the plots are so different and I think that's the only difference.
If you love Wang Xing Yue's acting, I think you'll love this.

Both are dramas based on detective themes
Both have murder mysteries
Both have great story telling
The story pacing and the action scenes are great

Both are dramas based on detective themes
Both have murder mysteries
Both have great story telling
The story pacing and the action scenes are great

Both are dramas based on detective themes
Both have murder mysteries
Both have great story telling
The story pacing and the action scenes are great

Both are dramas based on detective themes
Both have murder mysteries
Both have great story telling
The story pacing and the action scenes are great

Both are dramas based on detective themes
Both have murder mysteries
Both have great story telling
The story pacing and the action scenes are great

Both are dramas based on detective themes
Both have murder mysteries
Both have great story telling
The story pacing and the action scenes are great

Both are dramas based on detective themes
Both have murder mysteries
Both have great story telling
The story pacing and the action scenes are great

Both are dramas based on detective themes
Both have murder mysteries
Both have great story telling
The story pacing and the action scenes are great

Both are dramas based on detective themes
Both have murder mysteries
Both have great story telling
The story pacing and the action scenes are great

The Killing Vote and Trigger share similar pretenses: involving the public, giving them a choice, and the resultant of deaths. Both MCs are Police Officers who do things in unconventional ways, and the enemy is closer than what they think. Both shows delve into the morality of taking justice into their own hands instead of relying on the law. Both shows have an emotionally driven plot, which makes them quite similar. For a more level-headed, calculative but risk-taking MC: Trigger is perfect. For a more impulsive, emotional and risk-taking MC: The Killing Vote is my rec!