The c64 scene, as most demoscenes, thrives on copies, yes. The first one isn't a copy, and it's in an interlace mode. I can't explain what it is exactly (just think two multicolor pictures offseted by one pixel flickering like mad every second), but do you think art that goes to a c64 demoscene gfx compo, that will be shown ONLY on c64s, wouldn't work on a real c64? Suffice to say, yes, all of them are proper c64 pieces.