K4005 version

I have bought last week in one of the 4 electronic shops in Brussels, a K4005 kit. It was supposed to be the last version. But, on the box, it is written 4005. The salesman told me that that was the last version K4005B, even if it is not written on the box.
But, on the PCB, it is written K4005’3.
Did I pay the normal full price for a old stock ?
What are the differences between K4005’3 and K4005B ?
Thank you very much.

The new version is no longer supplied with the metal cover plate.
There are no technical differences.