The D4 wasn’t in ENT, they used a K’t’inga model from DS9.http://www.ex-astris-scientia.org/schematics/d4-bonchune.jpg
I have always seen this ship from Enterprise called a D4. I know they used the model because they didn't have time or money to make a new one, but it still looks just like this new D7.
The D4 model was made and ready, but the producers didn’t want to use it. The artists even sent a render of the scene with it, but they turned it down. They were insistant on using the K’t’inga.
https://memory-alpha.fandom.com/wiki/D4_class_(concept)
https://memory-alpha.fandom.com/wiki/Vorok's_battle_cruiser
The D7 in DSC has a lot of differences from the D4.
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