Which camshaft is the exhaust or inlet? they both have 90400 230 cast into them but also have K62 Y1 and K62 Z3 engraved on them between the 3rd and 4th cylinder cam lobes.

I think that the exhaust camshaft is K62 Y1 and the inlet camshaft is
K62 Z3 can anybody confirn this?

Thanks in advance