There's definitely a difference in the hardness of different nut locking blocks or their finishes- at least within generations of Ibanezes, and Jackson 1k/OG/SP(?) Floyd models. They all mostly look the same until you've used them for a little while. That said, rough surface finishes and rougher dimensions are just as definitely the trend of the cheaper ones I have used, but I couldn't say it's conclusive enough to suggest which ones are either. I also don't really think it makes a difference to the guitar.
I don't know if the Special and OG have different blocks, but it wouldn't surprise me. I'm 99% sure the OG and 1000 do.
I don't know if the Special and OG have different blocks, but it wouldn't surprise me. I'm 99% sure the OG and 1000 do.