1.73% difference not assuming differences in pushrod angle, etc. That is an ironic number given the rocker ratio LOL
Using lobe values, if you have a .330 lift lobe, .330*1.73 = .571, with a 1.76 rocker, it'd be .581
Using percentage difference, .571 * 1.0173 = .581 as well
Keep in mind that affects the entire curve, so it functionally adds duration at the valve too. The valve will be open the same amount at .050 with hyd rockers as it will be at .0491 lobe lift with 1.76 adjustables. Not significant IMHO, but technically it does hang the valve open slight longer