Default [Q] Different MD5 sums

Maybe I'm doing this wrong, but:

I just changed over to Verizon and rooted recently using Kingo with Safestrap as my recovery. All seems to go well when doing a b/u, but I'm a bit confused regarding the md5 files included in the backup. I'm trying to verify the files I copy to my pc from the phone.

In example:
system.ext4.win000 (on phone) matches system.ext4.win000 on pc
system.ext4.win000.md5 (on phone) matches system.ext4.win000.md5 on pc


system.ext4.win000 does not match system.ext4.win000.md5 on either pc or phone.

The above holds true with 3 different b/u's.

So are the files with the md5 extension solitary md5 sums for easier and faster comparison, or should the md5 files match the win.000 files?

The backups verify on the phone itself using AFV. Simply long pressing on a folder created by SS to contain the backup files returns verified as good. This is why I assume that AFV is comparing the .md5 files to the .win000 files, yet they do not match each other when I manually check with HashTabs.

I hope this isn't too convoluted. Thanks for any input.