2:30 movie is more megs than 3:00 when compressed? Why?

I've got two short movies.
One is 2:30 minutes.
One is 3:00 minutes.
For "Format" under Export>Quicktime Conversion I used the default "High Bandwidth" setting. (H.246)
For reasons I cannot figure out, the 2:30 is 38 megs, and the 3:00 is 25 megs. The settings are exactly the same for both.
The 2:30 movie has two video tracks: one is the moving footage, and one is a static watermark on top. There are four audio tracks.
The 3:00 movie has two video tracks as well: One is moving footage, and the other is the same static watermark the other movie has. There are two audio tracks.
Why is the 2:30 so much larger? There's even more motion in the 3:00 one. What determines the size of the file? I have tried this multiple times and the shorter movie is always much larger.

I'd think this is possible, there are several factors that have to be dealt with in compression schemes.
Is the video in the 2:30 version significantly different?..camera motion/color saturation/visual content?
Simply 'color-correcting' can add to this as well.
Might want to search this forum for 'compression', 'compression schemes', 'video compression' for more insight. Graeme Nattress and others have posted significant details in this regard in various posts....it is a world unto itself...of which I know little ;]
Kevan

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