You asked what the difference was between the Ellie teaser and the latest teaser for the Sam event. The difference is that the Ellie teaser actually teased us with hints that the two would get naked.
So far, like the Aiden teasers, the Sam teaser hints at nothing of the sort. All that we know is that Sam and Patricia are going to listen to Sam's band. Ellie might turn up at some stage. The 2nd part of the event will happen, and then Sophia will go to Cathy's.
Nothing whatsoever to make me think: wow, maybe I should reconsider not playing the Sam route.