Yes it’s the same thing. The confusion comes, I think you call Rosseyanka of pollinisation F2 and F3, who are descendants of Rosseyanka.
Rosseyanka is a 50% F1
But today it’s a mistake to say that rosseyanka is the only existing F1. I know others.
In central Europe , these male pollinisators ( I don’t know if they are the same ones) are called VKH1 and VKH2 for exemple