Does bring up something I've always wondered.
In that period, DC launched
THE DARING NEW ADVENTURES OF SUPERGIRL
THE FURY OF FIRESTORM
THE NEW ADVENTURES OF SUPERBOY
THE SAGA OF THE SWAMP THING
THE NEW TEEN TITANS
(also miniseries like SWORD OF THE ATOM and SHADOW WAR OF HAWKMAN)
So basically any time they launched a book with a #1 that was based on a property they'd published before, they'd add some sort of descriptor instead of using the simpler basic title (three of them would eventually revert to the simpler title, SUPERGIRL, FIRESTORM and SWAMP THING, after they cleared the number the earlier volumes reached. The other two never matched their predecessors before being cancelled or otherwise renamed). They wouldn't use such descriptors for new titles, or when they restarted a book with the old numbering (I think BLACKHAWK was the last time they did that).
So was that just a marketing thing, since the descriptors were a Marvel thing (Amazing Spider-Man, Mighty Thor, Uncanny X-Men) and Marvel was kicking their ass in sales, or was it that they for some reason didn't want to re-use titles, and confuse the issue with more than one SUPERGIRL #1. Which seems like a quaint concern now that we'll probably see the sixth or seventh SUPERGIRL #1 soon enough, and Marvel is willing to publish two different #1's for a book in the same year with the same creative team and logo.
No, seriously, these are two different books published in the same calendar year...