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Can you use a QOU120 in place of a QOU120C1H?

Is there a replacement for QOU120C1H?
Product Line:
QO Miniature Circuit Breaker
QOU Unit Mount Circuit Breaker
The QOU120C1H is a breaker in which part of the molded case is milled away - no direct replacement, not UL listed. System recognized part. Package of 25.
The QOU120 is not a replacement.
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