What's different about Safari.app in OS X 10.9.1 and Safari.app on the Recovery HD?

Having mounted the Recovery HD¹, I MD5'd the Safari binary from the BaseSystem.dmg and MD5'd the Safari binary from my OS X Mavericks 10.9.1 install:

• /Volumes/OS\ X\ Base\ System/Applications/Safari.app/Contents/MacOS/Safari:

  669623eb8c35daf0a1a90b4895943723

• /Applications/Safari.app/Contents/MacOS/Safari:

  668065167a8b3b9ad3034bdba400a9dd

What's been changed in Safari.app on the Recovery HD?

_{¹ Mounted using:}

diskutil mount Recovery\ HD && hdiutil mount /Volumes/Recovery\ HD/com.apple.recovery.boot/BaseSystem.dmg

On OSX 10.9.1 :

OSX's Safari is a 7.0.1 (Build 9537.73.11, MD5 Hash 668065167a8b3b9ad3034bdba400a9dd)

Base System's Safari is a 7.0 (Build 9537.71, MD5 Hash 669623eb8c35daf0a1a90b4895943723)

So /Applications/Safari differs on the Recovery HD.

On OSX 10.9.2 :

• The System Safari : v 7.0.2, Build 9537.74.9 : MD5 Hash 1d2c91b644b46f41bfb54c214600a688

• The Recovery partition Safari : v 7.0, Build 9537.71, MD5 Hash 669623eb8c35daf0a1a90b4895943723

Conclusion : Apple's doesn't seem to update the Recovery Partition when OSX gets updated !