No, if you belonged to the OBC category but secured a seat under the "open" or "general" category for your diploma program, you wouldn't be eligible for EBC scholarships typically.

EBC scholarships are meant to support students belonging to the Economically Backward Class category. There might be specific income-based criteria to qualify for these scholarships.

Since you secured a seat under the open category for your diploma, you weren't considered under the OBC category during the admission process.

I hope it helps!