Assuming these are undrilled balls.
Top weight is just weight to compensate for weight loss when the holes are drilled.
Pin length is referring to how far the pin is from the cg. Too Short/Long distances can limit layout options that about all.
And as long as they are not on the unapproved balls list, they all can be drilled.
Pin Up/Down is referring to the layout used and where the pin is in relation to the finger holes after drilling.
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