Nomenclatural equality for monomials at different ranks

[mdoering]

Especially suprageneric monomials can be used at varies ranks.

• Should these be considered different names in the nomenclatural sense or is that merely a different taxonomic usage of the same name?
• Is there a difference between botany and zoology?
• Is it sufficient to distinct family group names and genus group names and ignore the exact rank? Considering we also want to track unavailable names

For example Dianthera exists twice as a genus in IPNI:
http://beta.ipni.org/?f=f_generic&q=Dianthera

And both as a section and subsection both from the same publication, but apparently different pages: http://beta.ipni.org/?f=f_infrageneric&q=Dianthera

So this clearly demands for unique ranks in subgeneric names.
I presume we have the same case for suprageneric names