2 pounder pom pom proof shot

[pzgr40]

Yesterday I cut this 2 pounder proof shot.
It occured to me that the firing cap in the shellcase is of a different type. Why is this and does it have consequenses for the type of powdercharge? (

 

[Basilisk]

Looks like an electric primer, No 13? Usually used on 2pr cases re-used for things like depth charge throwers and the Hedgehog, although apparently occasionally turns up in regular 2 pounder cases.

 

[LEAFLET]

Like Baslllsk said looks like No 13 but there are some differents, look at the picture yourself DJ.
But I can't find any other primer looks like yours.
LEAFLET