[Flac] Accurate or Not

[j .]

I accidentaly re-ripped some of my CDs and did take this as a chance to do some comparison. Here is what I have found for on of the songs.
   
  Peak level 100.0%
  Track quality 100.0%
  Copy CRC C8F5065F
  Track not present in database
  Used drive  : _NEC    DVD_RW ND-3500AG   Adapter: 0  ID: 1
Read mode   : Secure with NO C2, accurate stream, disable cache
Combined read/write offset correction : 0
Overread into Lead-In and Lead-Out : Yes
Additional command line options : --best -V -T "artist=%a" -T "title=%t" -T "album=%g" -T "date=%y" -T "tracknumber=%n" -T "genre=%m" -T "comment=EAC 0.95beta2 / FLAC 1.1.2 --best" %s
   
  Peak level 99.1%
  Track quality 99.9%
  Copy CRC DFD55D78
  Accurately ripped (confidence 6)  [60892C93]
Copy OK
  Used drive  : _NEC    DVD_RW ND-3500AG   Adapter: 1  ID: 0
  Read mode               : Secure
Utilize accurate stream : Yes
Defeat audio cache      : No
Make use of C2 pointers : Yes
  Read offset correction                      : 48
Overread into Lead-In and Lead-Out          : Yes
Fill up missing offset samples with silence : Yes
Delete leading and trailing silent blocks   : No
Null samples used in CRC calculations       : Yes
Used interface                              : Native Win32 interface for Win NT & 2000
Gap handling                                : Not detected, thus appended to previous track
Additional command line options : --best -V -T "artist=%a" -T "title=%t" -T "album=%g" -T "date=%y" -T "tracknumber=%n" -T "genre=%m" -T comment="%e" -T "comment=EAC (Secure Mode)" %s

  When I decompress the first one the file size is 50,826,764 bytes vs. 50,869,100 bytes for the second one. The first one definitely seems to be accurate according to the result. I assume the second one should be as well because all song are reported as Accurately ripped (confidence 6). So then why do I get different sizes when decompression the flac files?
   
  Thanks

       
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