Yes, the pan changes things.
The base rsx and rsx-s have different sticks w/holes in different places (I've compared them). I don't think there is a stock setup that matches your block/pan combo.
Use an k20a2 stick and mark it to adjust for the different in block height (~19mm) or to be more exact, keep in mind it takes 5qts to hit the full mark on an a2 setup. Poor in 5qts and use oil level to scribe your new full mark on the stick.