Can two organisms with the same phenotype have different genotypes?

Let's look BB and Bb

They both have the dominant trait which means they both have the same physical appearance (phenotype) , but while BB has both dominant and Bb has one dominant and one recessive that means that although Bb has the same phenotype as BB, it has a different genotype because it has a bit different genetic makeup

d bonding propertys

explanation:

carbon can form so many different compounds not just with oxygen

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.