in my experience, most seed stock has a high level of variation, it is almost impossible to get a plant that matches one grown from a single seed by X, which then get touted as the real deal, fitting wonderfully in to the scarcity model of all shitty capitalists. Take an apple tree for example, can you grow the tree as the mother if you take the seed stock from the fruit?
I suspect the wanker that did this so called chemdog#4 planted hundreds of seeds all called Chemdog, liked the forth one he planted and so here you go, that said, it was never #4 just a seed of chemdog and a pheno that came out that happened to have a label called #4 stuck to the pot. Ergo its all just chemdog and personal taste from natural variation that leads to marketing BS phenos as strains. You are probably as likely to find a similar plant to #4 just by buying enough chemdog and then you can avoid the silliness of clone only bashers who always jump on people that grow from seeds whose packet declares XYZ.