Channel replacements for single hung windows

A quick learner from Florida says:
I have identified the S380-35, but the 3425 stamped on the old channel is not listed. Would I be advised to go with the 3430, or the 3420?
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Casey from SWISCO responded:

Good question. You will need to weigh your sash on a scale and refer to the sash weight chart listed on the store page. 

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