Mizuno Pro irons are not cavity back. They are muscle back and there is a difference. In addition, the G425 top line is nothing like the Mizuno top line, and the heads are longer too.
The forgiveness in the Pings is more than the Mizunos, I believe.
I had the i25 irons which were good, but the Mizuno MP20 HMBs that I got fitted for have been better for me. That said, those two irons are a little closer to apples and apples.
Mizuno vs ping irons | Golf Monthly
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