No, OpenOffice.org is still OpenOffice.org but since it was taken over
by Oracle a bunch of the developers have started the LibreOffice fork
(due to political differences) and a number of the major distros have
decided to support them by switching to LibreOffice as the default
productivity suite.

At the moment, the two are still compatible and extensions produced for
one should run on the other, but this situation is very likely to change
over time.