The LS1/6 pan will work fine with the LS1/6 dipstick. Match the dipstick with the oil pan.
I've heard the LS2 pan is supposed to be better from this forum. I assumed they were talking about an LS2 corvette pan. I have a stroker LS2/402 so the windage tray needed spacers and because of that the oil pan had to be trimmed in a few places. I don't know if you have to do that with the LS2 pan.