Difference Resulting Test "webpagetest.org/lighthouse" & "lighthouse extension"

[font=Arial]My site is “Couponforless.com
I tested some pages of the site on “webpagetest.org/lighthouse” & “lighthouse extension”, then there is a difference? Someone tells me the reason, and should I use any result :-/? Some example demo below:

Link 1 tested by Webpagetest.org/lighthouse
Link 2 tested by Lighthouse extension

Thanks![/font]