Yea they're pretty different from each other. What I can tell you is that Happy Days is pretty dark compared to Left Behind if you plan on listening to themI really like the Left Behind one, but the Happy Days one is good too, just has a very different style. I haven't heard either song, but I have a feeling that they're quite different from each other, based on the artwork.
Thank youu!! It took me hours to draw it, and I'm really proud how it turned outThat left behind one was really phenomenal, I love all the work you put into it!