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SCP and SQP will never tie, and that is not a bug. SQP aggregates by query and counts an ASIN once per query it appeared in; SCP aggregates by ASIN across every query at once. A shopper who searched three terms and bought once is three rows in SQP and one here. Add SQP's purchases and you get 1,884; this page totals 1,718. The 166 difference is that overlap, and it is the reason SCP is the honest denominator for “how is this ASIN doing in search” while SQP answers “how is this phrase doing”.
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