Will youtube recompress video it has already compressed?

Jungle Explorer

I Love YTtalk
Okay. So I want to make a smash up of several videos that I already uploaded to youtube. I was thinking of just downloading the videos from youtube to use to make the smash up, rendering the final video with matching settings as the videos that were downloaded. So basically, the videos will be exactly the same as the videos I downloaded. My question is; will youtube reprocess and compress the video? This could produce a video of much lower quality if they did.
 
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