Viatris launched two versions of its interchangeable insulin biosimilar. Why?

Viatris launched two versions of its interchangeable insulin biosimilar. Why?

Source: 
Fierce Pharma
snippet: 

It's official: Biocon and Viatris have launched their historic interchangeable insulin biosimilar, Semglee. The drug, which references Sanofi's blockbuster diabetes med Lantus, will roll out in a branded and unbranded format, and either version can be substituted for Sanofi's med at the pharmacy counter.