Hilti hammer drill bits?

[kitty]

Hi,

I was browsing a flea market and noticed that TE-CX Hilti SDS plus drill bits are available in multiple versions.
For example 18/48cm and 18/47cm.
On Hilti's site I only see the 48cm version.
So where does the other come from? Is it older? Are they, both as good, quality-wise, or the newer are better?

 

[Corbs]

There the old ones you will notice the old ones have balls on two of ends