Neighbor has a pair of 500HOs, one standard, one Richard Petty edition 2005 I think.
As far as I can tell, the only difference is color, decals and stickers on those two.
They take same suspension bushing kits, wheel bearings and half shafts because I have changed them in both.
You can go on a parts page such as www.partspitstop.com
with online pictures of individual assemblies and look up the two models and compare part numbers.