Rocker arms

[jwc1080]

I have a 93 Nissan D21 with the KA24e with 141k miles and the lash adjuster on my number 1 cylinder exhaust rocker arm will not bleed the air out and become tight and is causing a tick. The timing chain and all tensioners and components are new by the way. But I took a rocker arm off another KA24e from number one exhaust cylinder to swap out but the numbers on the camshaft side of the rocker arm is different than my original. They don't appear to be measurements but can anyone fill me in on what the numbers mean. From a majority of the parts diagrams I've read the 1 and 3 are interchangeable and the 2 and 4 are interchangeable due to the slant of the arm. I just don't want to put this in and fire it up and bend the exhaust valve somehow.