MSI Ventus 3X, Ventus 3X Plus, Shadow, Inspire - What's the difference?

Does anyone know what the difference is between the MSI Ventus 3X OC vs. Ventus 3X OC Plus vs. Inspire 3X OC vs. Shadow 3X OC? They all look the same except for some styling differences. With no reviews posted online yet and specs that look identical, it's hard to understand what the differences are typically in these models.