Mambo Switch, what is it?

I found this move called Mambo Switch on salsastudent.com/DancePatternsInt.html.

To an untrained eyes like mine, it looks like normal basic step.
Anybody with more experience, pls tell me what unique about this step.

Thanks much.

Hi Kenshinchan. If you count out the steps 1,2,3, 45,6,7 you'll notice it becomes 12,3,4 56,7

So, they just switched from stepping on the 1 beat to the 2 beat and then back to the 1. Hope that makes sense.