One possible difference could be in the level of detail. The novel might go more in - depth with character thoughts and emotions. For example, in chapter 71 of the webtoon, a fight scene might be shown more briefly compared to the novel, where it could be described with more elaborate language.
Yes, there are many good translations of 'Solo Leveling' novels out there. You can find them on various online platforms. Some popular ones offer accurate translations that allow fans to fully enjoy the story.
Yes, there are quite a few. You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. Some fanfics combine the leveling system from Solo Leveling with the Naruto universe in really creative ways, like having Naruto or other characters gain levels and skills similar to what's in Solo Leveling.
It's hard to give an exact number because new comics are constantly being added and some might get removed. But there are thousands of comics to choose from.
Well, it's tough to say precisely. Line Webtoon has a huge library of comics, and it's constantly evolving. I'd estimate there are at least several thousand, if not more.