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Hi and thanks for your question. The SHX78B75UC is our current 800 Series dishwasher whereas the SHXM78Z55N is an older model. The SHX78B75UC features more wash cycles and options as well. If you have any further questions, please contact Bosch Customer Care at 1-800-944-2904. We are here to assist you and address any questions you may have. Thank you.
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