Yes, Ralph DeLeo was Acting Boss (though one could question his day to day ability to run the family) for the Colombos because Carmine Persico is in prison. Andy Russo took over that position later on.

Barney Bellomo was Acting Boss for the Genovese because Chin had been indicted in the Windows case and wanted to step back.

Jackie D'Amico was the Acting Boss for the Gambinos because Peter Gotti was in prison.

You could have also called all these guys "Street Boss" and it would be the same thing. They had the position because they were on the street and Persico, Chin, and Gotti were not.

So I guess the question is, to show that Acting Boss and Street Boss are two different things, one would have to give an example of either A) two guys in these positions simultaneously or B) there being some specific case where a guy could be described as one but not the other.