"PDD-NOS" and "NVLD" seem to only exist in the US - or, at least, i've never encountered anyone from the UK with either of those diagnoses - most people with the former would be diagnosed either with autism or some sort of generalised "learning disability" label, and most with the latter would be either dyspraxic or maybe in a few cases AS with dyspraxia as a co-morbidity.
I think HFA is a commoner diagnosis in the US as well (or at least distinguishing between AS and HFA is, whereas in the UK those terms would be used pretty much synonymously).
In general, the UK seems to embrace the "spectrum" concept more, whereas the US seems to have more of a desire to classify everyone into an <i>exact</i> classification of what "species" of neurodiversity they are...