Questions about accuracy when comparing website matches

Accuracy of parity site matching for help
Http://www.langlang.cc/2713892.htm
Like this site is based on what exactly match to each online store corresponding to the product information, is it through the "keyword"? The feeling of using keywords sometimes matches is inaccurate

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Feel this should be the corresponding site provides interface it! Otherwise it is manual input! Automatic matching is not reliable!
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There are search programs that can match the crawled
For example, the "￥" or "$" numbers that appear in an article are presented as a key word.

I've seen this in a business case.

But specifically did not do the parity, do not know how accurate.

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