Any changes in external measurements for apple wireless keyboard gen1?

[winterquilt]

Can anybody please tell me if there any external measurement differences between the four evolutions of Apple's first generation of wireless keyboards?

• First generation (A1016) M9270LL/A
• Second generation (A1255) MB167LL/A
• Third generation (A1314) MC184LL/A
• Fourth generation (A1314) MC184LL/B

ref: https://en.wikipedia.org/wiki/Apple_Wireless_Keyboard


I am looking to buy a case for the keyboard, but I need to know if there are any differences when getting the keyboard as the slightest millimetre will render the case unusable.

Thanks!

 

[winterquilt]

It turned out there are difference between the last of the old wireless generation and newest one with an internal battery.