They won't work properly with V4, mostly because she is grouped differently than the Millennium 3 figures.

For instance, V4's breasts are part of her chest, whereas V3's are part of the Collar group. Also, they use a setup injecter that has to be applied before the magnets will actually do anything, and there isn't one for V4.

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If you're joking that's just cruel, but if you're being sarcastic, that's even worse.