Model 4000 differences

I have look appreciatively at your sites guidelines and have learned a lot. I decided I wanted a Model 4000. I went shopping and that's when I found more than one model of the 4000. Can you tell me the difference between an ORAL B Healthy Clean Pro White Precision 4000 and an Oral-B Professional Care SMARTSERIES 4000? I'm ready to buy, but I want to get the best Model 4000 that is available. Thanks so much for your assistance and your site in general.

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