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There are quite a few TV-versions of films, especially from the '70s, that have different scenes in them. This generally happens with R-rated stuff or harder PGs (no PG-13 back then), where some scenes had to be trimmed or deleted. To get the running time back up, alternate scenes were re-inserted, scenes that weren't in the theatrical prints.
For example, the old TV prints of Mel Brooks' Blazing Saddles have no fewer than four completely new scenes. Airplane! has around five new bits. These are things from the cutting room floor, the kind of stuff that today would be included as DVD supplements. In generations past, the studio - not the director, would hang onto them for the television print.
And sometimes the extras had nothing to do with censorship and running time, but were there to make the TV brodcast more appealing, to give fans a reason to tune in. Superman: the Movie was maybe the biggest example of this. When ABC ran it in '81 (remember, still a couple years away from VCRs and home rentals hitting their mainstream stride) they made a big deal about new scenes being included. These scenes are now all available on the DVD - some reinserted into the movie itself, but in '81 this was prety cool stuff.
So, it happens.
But to answer your original question, no, these are not "director's cuts". The directors have nothing to do with such TV additions.
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"Film is a disease. When it infects your bloodstream it takes over as the number one hormone. It bosses the enzymes, directs the pineal gland, plays Iago to your psyche. As with heroin, the antidote to Film is more Film." - Frank Capra