Why pulled image is smaller than original image from the private registry?

The sizes of image[suse/sles12] is 258.3MB on registry,but when I pulled it on local host ,it is 258.2MB only. Why?

pivate registry:
jya@controller:~$ docker images |grep suse
opensuse latest 7617deda9fe6 11 weeks ago 97.7 MB
10.46.169.17:5000/suse/sles12 latest 3f58b8127be2 3 months ago 258.3 MB

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  • local host:
    monkey@monkey-VirtualBox:~$ docker images |grep suse
    monkey@monkey-VirtualBox:~$
    monkey@monkey-VirtualBox:~$ docker pull 10.46.169.17:5000/suse/sles12
    Using default tag: latest
    latest: Pulling from suse/sles12
    a3ed95caeb02: Already exists
    5513e1f80831: Pull complete
    Digest: sha256:6c04761f63fd827e8f0c251b753b71d24e241276b4defd41a34af39bd71f7fe4
    Status: Downloaded newer image for 10.46.169.17:5000/suse/sles12:latest

    monkey@monkey-VirtualBox:~$ docker images |grep suse
    10.46.169.17:5000/suse/sles12 latest 3f58b8127be2 3 months ago 258.2 MB

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