How to get .avi the right size in my new video?

I made some videos in premiere  pro, and then i exported them as .avi. Now i want to use these videos I made in another video, but when i just put the .avi file in my new video, they are smaller with a thick black border around them. This seems strange as I used the same setting while making these videos.

Is there a way i can get them te same size as my new video? Or should i import the videos differently?
Thanks in advance, a lot!

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