Yup, make 'em all the same height (rise). My recollection says the magic number is 66. Rise x run, in inches, should equal 66. I always try to use as close as possible to 7 1/4" rise, and 9" run. Anything greater than 7 1/2" rise will feel steep. Also, be sure to put your step boards on so they will bow downwards (not cup upwards). It seems counter-intuitive, but the heartwood should be at the upper side of the tread. They cup opposite the growth rings. That's because the rings shrink the same amount laterally, and you have a much longer ring on the outside of the tree, so it shrinks more.
I seem to recall that 66 is also the height, in inches, from the closest tread to any overhead obstruction.
Good luck with them, stair building is the mark of a true carpenter.
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