There are many fluorescence materials that fluoresce brightly at 405nm and 445nm. There are some that will also fluoresce at other wavelengths as well. But, these are normally fluorescent materials and not just random objects of a certain color under white light. I have some uranium glass that fluoresces yellow/green at 405nm. But, it won't under green or other colors I've tried.
Just regular old fluorescence at work. Shorter wavelength (green -- more energy) excites an electron in the material to a higher energy state and steps its way down to the lower energy state emitting a longer wavelength (orange -- less energy) along the way. It's just more noticeable with UV light since there is more of the visible spectrum to see that fits the "less energy" criteria.
Different florescent dyes absorb different wavelengths, not always UV. If you go to the exciton website www.exciton.com there is tons of information on hundreds of dyes including their absorption spectrum. Some dye lasers are pumped by argon lasers.
It differs by compound indeed, both the absorption wavelength and the emission wavelength.
I suppose things in orange plastic objects are azo dyes, and they will probably take in green light and fluoresce orange (or red) if exposed.
It's comparable to how you can light up green glow in the dark stuff quite easily with blu ray 405-ish laser light. This only works when the wavelength you excite the material with is shorter than the color emitted. You can throw an infinite amount of red light at a gitd toy, but it will never emit any light (unless you set it on fire).