Weight doesn't matter... That's a bold statement

Don't want to start (restart) a debate, and I agree that there is a lot more than weight when it comes to choosing a bicycle, but lighter is faster. Especially in hills. A 8kg bicycle will require more watts to maintain a certain velocity than a 7kg bicycle. It's physics. Now, is it significant? That is subjective.

Regarding the op's question, the endurance seems to have better and lighter components. Combined together on a full built, I have no problem believing that they shave over 1kg off.