No, strong similarity equals ground for suspicion.
Close is exactly what they are. However, I accept that the Black Hole design for Vincent had already been made independently; I hadn't understood the timing. But to suggest that it's reaching and unfair to the creatives here to suggest that there might be plagiarism in the similarity of a small head on a squat body, and in two cases both spherical bodies with very short protrusions, is itself to be unreasonably dismissive. Given the VERY wide range of choices that might be made for robot/droid body designs--just look at Maximillian from the Black Hole, or the tentacular things from the Matrix--these three are indeed very similar.