Some Trotskyists rejected Communism (and Trotsky) to become conservatives. That does not constitute intellectual linkage unless you can drag Trotskyite concepts out of new-conservatism. Which I think you would find pretty hard to do.
BTW, neocon is a term very few of these people have consistently applied to themselves.
There it is. The entire thing is another fabrication on the part of a Leftist writer who's attempting to link a handful of ex-Trotskyites who because neo-conservatives to the neo-conservative movement as a whole.
In other words, it's bit like saying that since David Horowitz is an ex-communist and now a popular right-wing author, the ghost of Stalin haunts the right-wing publishing industry. Patently idiotic, of course, but standard fair for the guilt-by-association crowd.