Are there two Borg collectives?

Could you elaborate on the existence of two distinct Borg collectives? I'm intrigued by the prospect of there being potentially two separate entities operating under the Borg moniker. Is there evidence to support this theory? How do these two collectives differ from each other? Do they have separate goals, tactics, or technologies? Are they aware of each other's existence? Could there be potential for conflict or cooperation between them? Understanding the nuances of this potential dichotomy would greatly enrich our knowledge of the Borg and their complex dynamics.