I bet when you order from a website that shows an orange head Bonito, what arrives in the mail is a black head "Limited Edition." NovarossiDirect shows the same purple head version that I believe they originally sold back in 2011 when the Bonito came out, but when I placed my order 2 months ago, I received the black head pictured below.

I don't know what all is different between the 2, but the parts sheet that came with mine doesn't appear to be online anywhere, so I took a picture of it and put it side by side with the one on the Novarossi website to compare part numbers:




So looks like it's a different part number for the piston, carb body, and back plate. What's different about them beyond the part number, I don't know.