no its not, its a completely different program since the one who managed this is from a different team called Bullet They're very similar since TechArts and Bullet has their affiliation with each other but different formats are used on both versions.
i'm currently figuring out on how to fully update the 3DCG to its latest version Its actually up to you if you want 3D Custom Girl or the newest one which is 3D Custom Girl Evolution
In 3DCG, you can only customize the girl and make screenshots of them and also does some X scenes but thats about it
In 3DCG Evolution, you can customize the girl, interact with other people/NPC, you can also bring your partner anywhere you want, do some X stuff and you can see your character do it on your partner and etc. there are a lot of options in this version