In general yes. After the first difference the compressed streams will be basically random compared to each other. However there are numerous things that may avoid this.
For zip files each individual file is compressed independently. So unchanged files and prefixes don't need to be resent, even if once a file changes the entire tail end of it needs to be resent.
Some times compression algorithms "reset" periodically. For example the `gzip --rsyncable` patch. This basically resets the compression stream so that a change will only affect part of the compressed file. This does have a cost in terms of compressed size because the compressor can't deduplicate across resets. However if the resets are infrequent you can maintain fairly good delta transfer with little space overhead.
Additionally some delta transfer tools detect common compression and decompress the file "in transfer", performing the delta checks on the original file.
For zip files each individual file is compressed independently. So unchanged files and prefixes don't need to be resent, even if once a file changes the entire tail end of it needs to be resent.
Some times compression algorithms "reset" periodically. For example the `gzip --rsyncable` patch. This basically resets the compression stream so that a change will only affect part of the compressed file. This does have a cost in terms of compressed size because the compressor can't deduplicate across resets. However if the resets are infrequent you can maintain fairly good delta transfer with little space overhead.
Additionally some delta transfer tools detect common compression and decompress the file "in transfer", performing the delta checks on the original file.