Yes, they are both WebKit, though largely irrelevant. Personally, I’m a daily KDE user. I did install falkon out of Curiosity for a short while. But neither it or konqueror are generally in any distributions base install. Including KDE neon.
They are usable, so long as you don’t use any sort of add-ons.
Falkon is based on Qt web. So it is also WebKit.
athairmor@lemmy.world 2 hours ago
Apple’s WebKit (WebCore+JavaScriptCore) was originally a fork of KHTML/KJS. They shared at the beginning but not very well. They eventually opened up their source and made changes that were more friendly to other developers. A lot of browsers and embedded renderers use WebKit, now, besides Safari and KDE based ones.
Google forked WebCore for Chromium. I don’t think they share a codebase, anymore. Edge, Opera and many embedded renderers use Chromium.
Anyway, I just think it’s interesting that most every browser out there is descended from KHTML.