DW 740cc injector question.

[ZeNkI S14]

I am curious about the changes in the deastchwerks 740cc injectors. how can you tell the difference in the changes from the purple tops of the 370's vs the 740's i have looked at pixs and that the 370's are identical to the DW 740's. Need some help figuring this out or if someone has posted any information about the difference between the looks of the injectors, thanks.

[240life]

mine were more of a shade of grey and less purple then stock 370's