I think that the word 'redneck' was only used about half a dozen times across all the seasons of the original show, so it's not like they were censoring a common word for the kids' version.
I found a website that compares two words. Here's what it has to say about Roughneck and Redneck (obviously other definitions will vary):
roughneck
Noun
Any laborer on an oil rig
A rowdy or uncouth person
redneck
Noun
(slang, pejorative) An uneducated, unsophisticated, or poor Caucasian person, typically used to describe residents (of any gender "Country Music Lyrics New Country Tunes") of the rural Southern US.
(slang) The nickname given to miners who wore red bandanas for identification during the West Virginia mine war of 1921. "West Virginia Division of Culture and History"
(UK, archaic) The nickname given to Roman Catholics in the nineteenth and twentieth centuries.