What is the difference? We can't tell. What we do know is what Ba Rea so perfectly wrote:
"Paul is brilliant, with an incredible wealth of information about monarchs, which I deeply respect. [But, for several years his data is not trustworthy.] But he loves controversy, accusation and setting up interesting red herrings even more. He regularly blurs lines of truth (usually by omission of important information so that he can stand back and let us do the damage) in order to attack scientists, support his theses or defend HIS work as an insect exterminator."
[I think she hit it straight on the nail head.]http://basrelief.org/Pages/ba.html
In case you are curious, who Ba is I have posted her website.