Final answer:
Different alleles and same allele copies are both versions of genes found on homologous chromosomes. Heterozygous organisms have two different alleles, while homozygous organisms have two identical alleles.
Step-by-step explanation:
Both different alleles and same allele copies have in common that they are versions of genes. Alleles are different versions of genes, while same allele copies are identical versions of genes. Both different alleles and same allele copies are found on homologous chromosomes in diploid organisms, with heterozygous organisms having two different alleles and homozygous organisms having two identical alleles.