The Yeti series of mics are likely all basically the same other than added features or 'extras' for a given model (headphone jack, XLR connection, software etc). They will likely sound alike or indistinguishable from each other. From the video I don't think anyone other that the girl singing in the video could tell you which specific model she is using. If you're a Youtube member try messaging her with your question and perhaps she'll respond.
If you're considering buying a Yeti it comes down to features or 'extras' you want/need based on what you want it for and your budget. (Helpful hint: Depending what you want to do, you would probably better off in a long run buying an XLR connected mic and a USB interface)
