Even if it turns out to be the case, there would be two forms of life separated by billions of years of evolution. Mistaking them would be much less likely than

Even if it turns out to be the case, there would be two forms of life separated by billions of years of evolution. Mistaking them would be much less likely than mistaking a cell from the wing of fruit fly from an onion peel cell: while on the outside they may look similar, the DNA of the fruit fly has about 170 million base pairs, while the DNA of the onion has 16 billion of them.