How much faster does the 12W wall charger charge versus using the 10W when charging the 128gb 4th generation iPad?

I was wondering how much faster the 12W charger is in charging the iPad 4th generation, 128GB versus using the 10W charger. Is there a significant difference. I have a few 10W and I'm wondering if I should replace them with 12W chargers. Thanks! :)

Apple 12W USB Power Adapter

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    Its not easy to answer this question because it depends on the state of the charge and condition of your iPad and the charging profile for that model.

    As a rough estimate it should be 20% faster. 10W is = 10 volt.amps 12W is 12 volt.amps. if 10VA = 100%. 12VA = 120%.

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