Why 2 same files have different size?

I have 2 same files:

Romans-MacBook-Pro:cut poma$ md5 src.mov 
MD5 (src.mov) = 7d59d01e5efffe3a258eff86d8b775a0
Romans-MacBook-Pro:cut poma$ md5 copy.mov 
MD5 (copy.mov) = 7d59d01e5efffe3a258eff86d8b775a0

According to ls they have same sizes and same attributes:

Romans-MacBook-Pro:cut poma$ ls -l@
total 10681888
...
-rw-r--r--@ 1 poma  staff   290300838 Jan 19 13:56 copy.mov
    com.apple.quarantine            22 
    Mac_Metadata            20 
-rw-rw-rw-@ 1 poma  staff   290300838 Jan 19 13:12 src.mov
    com.apple.quarantine            22 
    Mac_Metadata            20 

But according to Finder and mdls they have different size:

Romans-MacBook-Pro:cut poma$ mdls src.mov 
kMDItemFSContentChangeDate = 2015-01-19 06:12:45 +0000
kMDItemFSCreationDate      = 2015-01-05 04:54:25 +0000
kMDItemFSCreatorCode       = ""
kMDItemFSFinderFlags       = 0
kMDItemFSHasCustomIcon     = 0
kMDItemFSInvisible         = 0
kMDItemFSIsExtensionHidden = 0
kMDItemFSIsStationery      = 0
kMDItemFSLabel             = 0
kMDItemFSName              = "src.mov"
kMDItemFSNodeCount         = 290301124
kMDItemFSOwnerGroupID      = 99
kMDItemFSOwnerUserID       = 99
kMDItemFSSize              = 290301124
kMDItemFSTypeCode          = ""

Romans-MacBook-Pro:cut poma$ mdls copy.mov 
kMDItemFSContentChangeDate = 2015-01-19 06:56:04 +0000
kMDItemFSCreationDate      = 2015-01-19 06:56:04 +0000
kMDItemFSCreatorCode       = ""
kMDItemFSFinderFlags       = 0
kMDItemFSHasCustomIcon     = 0
kMDItemFSInvisible         = 0
kMDItemFSIsExtensionHidden = 0
kMDItemFSIsStationery      = 0
kMDItemFSLabel             = 0
kMDItemFSName              = "copy.mov"
kMDItemFSNodeCount         = 290300838
kMDItemFSOwnerGroupID      = 99
kMDItemFSOwnerUserID       = 99
kMDItemFSSize              = 290300838
kMDItemFSTypeCode          = ""

AFAIK resource forks should appear in ls -l@ as com.apple.ResourceFork attribute. There is no such attribute on my file. What may be the difference between them?