1When git format-patch is run at different times or from different base commits, even for identical code changes, the patches can differ in:
 2
 3Element
 4Why it changes
 5Hunk headers (@@ -10,7 +10,7 @@)
 6Line numbers shift if upstream changed
 7Context lines
 8Different surrounding code after rebase
 9Hunk boundaries
10Git may split/merge hunks differently
11Function context (@@ ... @@ func name)
12Different function nearby