On the spot, I'd say if the rings fit the pistons, don't worry about the writings, except, as far as I remember, text on the rings should face up. I understand the dilemma of opening up original vintage boxes
For any rings, do the measurements for clearance. Then check the gap when fully compressed adjust if necessary, and go ahead. If in doubt, use the ones that came with the pistons, and keep the heps for an eventual later swap if needed. Or keep them unopened and sell them on ebay in the future, for a fortune lol. Mount with gaps facing correctly, as I suppose is mentionned in the documentation.
Any corrections most welcome.
And yes, I have managed to break rings when fitting... one learns the hard way sometimes.