$ mkdir src
$ touch src/file1
$ zip -r 1.zip src
  adding: src/ (stored 0%)
  adding: src/file1 (stored 0%)

$ unzip 1.zip -d temp
Archive:  1.zip
   creating: temp/src/
 extracting: temp/src/file1

$ rsync -n -av temp/src/ src/
sending incremental file list

sent 64 bytes  received 12 bytes  152.00 bytes/sec
total size is 0  speedup is 0.00 (DRY RUN)

$ touch src/file1
$ rsync -n -av temp/src/ src/
sending incremental file list
file1

sent 67 bytes  received 15 bytes  164.00 bytes/sec
total size is 0  speedup is 0.00 (DRY RUN)