RIG, I don't remember is the DA8 had Ti chainrings or not, if it does you may want to both chainrings just for cosmetic reasons if using chainrinsg from another group. My old calipers have broken, but comparing my DA9 with a spare 8S 600 and a spare '98 8S Ultegra crankset I can't see any difference in the chainring's thickness, maybe spacing between the two, but can't be positive.

I'm pretty sure the 9S chainring itself will be fine with the 8S chain and crankarm. The difference between 52T and 53T is nearly nothing.

Brad