It is more the other way around. The curiosity company and Rough Draft Korea produced 4 Seasons of Futurama (1ACV** - 4ACV**), but due to FOX's super planning on (not) airing them they got split into 5 seasons on TV.
I recommend you to check out CGEF's Episode Guide
. The bigger esplanations which pictures are in airing-season order. If you scroll down you get links to the Production order.
Also if your see said *ACV** code, you know what production Season it was. The number in front of the ACV indicates that. The number behind stands for the production time within the season set.