Can one tell by looking at the fuel filter head if it has been replaced with the latest model? Also, when did the improved model become available?

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TWO Identical 2005 Liberty Sport CRDS
#1 CRD, 174,000 miles. Eco tune, Samco hoses. Mobil1 0-40w used since day one
#2 CRD 143,000 miles. Bought used (unknown history) with 100,000 miles. Samco hoses.
Eco tune, new rockers, and 5 volt glow plugs installed at 124,000 miles

I installed mine in november 08. The new head unit came with a pigtail harness for the fuel heater connection that should be a dead giveaway that the new one is installed. I have not had any problems with the new head unit since. 30k since I haven't even replaced the fuel filter but am going to do it very soon.

The fuel heater plug on the new unit is maybe 1" wide, where the old one was about 1/2"

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2006 Jeep Liberty CRD, Limited
GDE Eco Tune, GDE TCM Tune, Bauer 203* Tstat, Amsoil EaA 201 Filter, Clean MAP, Samco CAC Hoses, Magnaflow Muffler #12226.
New Mopar Fuel Filter, K&N Filterminder, Fumoto Oil Drain Valve
225/75R16 Hankook Dynapros