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The difference is the included connector.
There are many differences here including color and what models the triggers work with. Here is more information showing the differences:
Agency Arms DIT2-43-G: Drop-In Trigger Glock 43 9mm Aluminum Gray 3.5lbs
Agency Arms AGEDIT2-43-B: Glock 43 Drop-in Flat Trigger w/Connector, Black
Agency Arms AGEDIT-45-B: Glock 20/21/21SF/29/29SF/30/30SF Drop-in Flat Trigger w/Connector, Black
Agency Arms AGEDIT-45-G: Glock 20/21/21SF/29/29SF/30/30SF Drop-in Flat Trigger w/Connector, Gray
Agency Arms AGEDIT-9-B: Glock Gen4 17/17L/19/22/23/24/26/27/31/32/33/34/35/37/38/39 Drop-in Flat Trigger w/Connector, Black
Agency Arms AGEDIT-9-G: Glock Gen4 17/17L/19/22/23/24/26/27/31/32/33/34/35/37/38/39 Drop-in Flat Trigger w/Connector, Gray
Agency Arms DIT-43-B: Drop-In Trigger Glock 43 9mm Aluminum Black 3.5lbs
Agency Arms AGEDIT-42-B: Glock 42 Drop-in Flat Trigger w/Connector, Black
Agency Arms AGEDIT-42-G: Glock 42 Drop-in Flat Trigger w/Connector, Gray
Agency Arms AGEDIT-43-G: Glock 43 Drop-in Flat Trigger w/Connector, Gray
Some Gen 5 models can be found here: https://www.opticsplanet.com/agency-arms-drop-in-trigger-glock-17-19-19x-26-34-gen5.html