Do JD sellers have to undergo product authenticity steps that Taobao doesn't require?

I've noticed some items on JD that appear to be more expensive than the same item on Taobao.

I'm not entirely sure if this is because the Taobao items are fake (the sellers are highly rated on both) or if it's because JD is simply considered a more "premium" buying experience with a higher upcharge, with both items actually being authentic in real life.

If something on Taobao is being sold for, say, 25% less than the same item on JD, then is the Taobao item guaranteed to be fake or something? Are JD sellers like the "gold standard" in China and products are guaranteed to be authentic?