Ahhhh...I never see when I get pms (one or twice in a year :mrgreen: )...so sorry for the late reply.
Congrats on the Mec one. I was tempted to buy it myself....mine has gone very yellow.

:evil:
Here is some older pics. This is roughly pictured what is important (variantwise) IMO:
-
3-line HK
- has three eye colors: black, brown and red
- Poch release. can read up here:
http://swspaceclub.com/wbobafett/poch-variants/luke-farmboy/
- China dude
- Mec (French Trilogo)
- Glasslite
All on this picture are from the same coo family
Differences in trouser colors on standard HK are normally dicolorations. Farmboy in general tends to get greenish pants (discoloration). Real greenish looking pants can be dound on PBP, real dark on TW, Poch and some large HKs.
2-line HK large:
- 2 different facial spray masks
- DT Version with brown eyes and alternative material to the body (plus different spray mask for the face)
- PBP scarred out version (material, haircolor, pant color etc.)
2-line HK small:
- The blonde version from teh small HK has strong brown pants. Others are discolored IMO.
TW- COO
- two different pant colors known
2-line HK large:
- three or more brown colors (darkbrown)
- Orange Hair: US and Aussie version (more greenish and more glossy)
2-line HK small:
- the HK and no coo version with brown hair. The haircolor can differ a bit on those. I would say two different colors.
-Model Trem
- Hungarian bootleg (I have by now a white one with all original weapons):
http://swspaceclub.com/wbobafett/my-collection/csillagok-haboruja/
So this is roughly what is out there (and is important), but everyone feels different about some of them!
Never the less I hope this helps you a bit
Wolff