Difference Between Update Files

Is there away to determine the differences between update files produced by mksys? I have two build environments setup a manual one and one using Leaf both targeting Legato 18.09.0. The two builds are using the same .sdef and source files but they differ in final size by ~.1MB.

What’s the best way to determine where these differences come from? In my past development experience I’d review the link file but I’m not sure where to find that.

Thanks.

Look like the command update-util is what I was after.