[Q] Difference between hardware revision number

[p0pa_24]

Hello,
I have a Nokia Lumia 800 and i have noticed two hardware revision numbers.
Mine is 112.1402.2.3. Others users have 112.1402.2.4. Are there any differences between these two?

 

[tiny17]

My guess would be that the newer version doesn't cover the micro-usb port.

 

[Maszt]

I have version 112.1402.2.4 and I think there is no difference between thoose two.
And mine cover micro-usb port

 

[Rusty!]

Could be something as simple as manufactured in a different factory, I suppose.