Difference between DV Mini Vivii Nova and Vision VV Nova heads

[MrsMustang]

I have a question out of complete confusion. I currently have two Vivi nova's, a mini and the 3ml. One is labeled a vision and one is not. Both heads are interchangeable with both tanks, the reason why I bought them both. I want another mini and a few more 2.4 heads. I noticed on the website the description states the DV head in not compatible with the vision head. In looking at the picture between the two heads i really don't see a difference between the two, other than one has short wicks and one has long wicks. Is there really a difference between the two? I want to make sure the heads i have and buy would be compatible with all three tanks.

Thanks!

 

[MrsMustang]

Nm, I figured it out.

 

[Swarley]

Do tell. Do they interchange by any chance?

 

[MrsMustang]

The Dv and Vision are different sizes. The threading looks to be the same its the height of the unit as a whole that looks to be different. The DV is the smaller of the two. I ordered two DV mini heads and crossed my fingers.