Why is the DNA codon table "equal" to the RNA codon table
Genetic code and codons are always used with reference to RNA. When talking about DNA, the the sense strand of a gene is considered its sequence. The anti-sense strand though is the template for mRNA synthesis, does not represent the gene. 

DNA-codon table has simply U replaced by T. Apart from a wikipedia article, I don't find the term being popularly (not colloquially) used elsewhere.