Stop thief!

[sicsok]

The German and British jets to compare? They only diferred (but there largely!) in essence: the engines... (radial vs. axial flow engines, you can not copy one piece of either from the other!)
However, the airframes and configurations of the respective jets that were put to war-duty are quite similarly shaped (Gloster Meteor and Me-262). And those airframes and configurations were hardly the important aspects of a "new age" design.
And back to those simpleton assumptions about the pure delta plane jets (Mirage, F-102, Gloster, Arrow, etc.): they all were predated by Lippisch and thus the designs are his grandchildren. These argue over their genes...
About the phraseology on this topics:
One Russian composer (Chaykovskij or someone from his age) told once:
"Great composers do not copy. They steal."