[CentOS] Tar of files

When I "tar" up an archive the files have an owner bob,
when I extract that to another machine bob is there also but user number is
different.
So when I extract bob is no longer the owner of the files but someone else.

Is there a good way to account for this ?
User ID on one box being different to the next box ?

I was expecting to untar and bob still be the owner .

Thanks,

Jerry