What is the different between JSB .25 34 grains and the Mrk II

[Pacman]

Hey

I have maybe not looked enough on all the data available - However I can't seem to figure out what the difference between the JSB 34 grain and the JSB 34 grain Mrk II is ..
I am using 0.25 (6.35 mm)

Can someone please elaborate ?

Just found 2 fast links to look over but looking at pictures do not tell me much 

https://airgunheaven.com/en/jsb-king-25-heavy-300-st-34-grains

http://www.pyramydair.com/s/p/JSB_Match_Diabolo_Exact_King_MKII_Heavy_25_Cal_33_95_Grains_Domed_300ct/1279

Second question:
A pellet sorter...for JSB where in this world can I order such a thing?

Hope some can help me out here

 

[Mick-VA]

This string has some observations on the differences.

http://www.airgunnation.com/topic/25-king-heavy-mk1-compared-to-mk11/

 

[blackdiesel]

The original has a larger skirt and had trouble fitting in a lot of magazines. The MKII has a modified skirt to fit in most magazines.

 

[Pacman]

Thank you a ton for the answer(s)
Mick - Cudos for a very none scientific but excelent review.

Guess I will have to test the Mk II just for the heck of it - I have tried Baracuda Hunter Extreme for the sole reason - It dont have to be an exact head- or heart shot - they die due to the impact and the damage.

But one can always improve

 

[Imold]

What I see is the 33.95 MKII have. 6.50 skirt diameter and the 33.95 Heavys have a 6.65 skirt diameter ...