Zezin

So I was making a compilation of videos by grabbing bits and pieces of each video. I did not realize until I exported that a lot of my video files have different dimensions and when put into the compilation it looks really bad. But the idea of going to each and every clip and widening them do NOT appeal to me for obvious reasons. Is there any way to just change the video file that I got the clips from and have that affect all the clips on the track?