Why change your filter Head?
I have the exact same Jeep and have never had any problems.
Our Export 2.5 CRDs came fitted with a Raycor filter from the factory....much to the envy of all USA owners of 2005/6 CRDs!
Once these USA owners found out about Raycor filter heads most moved to what you call the second generation Raycor head with great success.
The only problem with our Raycor heads is that the explanation in the Service Manual on how to bleed air out of it is incomplete!
You can download the 2002 KJ Service Manual here.....includes the Wiring diagrams and good advice on everything on the Jeep except for the engine section which is different on our Export models.
So download the 2002 KJ Service manual below but very important is to also download the section "2.5_2.8 Export Diesel" which covers our Engines nicely!
The only problem with this latter download is in the section on how to get air out of the Filter Head....they should say "unscrew and lift up the plunger....rapidly pump this up and own until resistance is felt...
briefly open and close the 10 mm brass screw on the filter head to let air escape .Repeat this process a few times and your existing Raycor filter head should work fine!
Downloads:
http://www.colorado4wheel.com/manuals/Jeep/KJ