I would count the ring density per inch as an indicator of strength, higher the count greater the strength and weight...
Depending on species perhaps as many second and third growth hardwoods are much stronger than old growth...Weight to can be the same or even heavier depending on growing conditions...
...Sitka spruce range from northern California to Alaska, more northern timber is heavier and stronger than southern timber, in general?
That has not been my experience with this species...Second growth often is stronger and more applicable to contemporary timber framing.
Seasoned timber should require less offset if you are draw boring and will more likely conform to the shape it was cut.
Green wood...being flexible...in my experience always is more conforming in joinery and application than dry wood. Then again, this perhaps is why, traditionally Timberwrights predominantly employ green wood...At least that has been my experience...
Really there is nothing to work with here to give any answers.
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