You certainly can't drop the 470R resistors. You may get away with using the internal resistors but they are about 10x the value of the suggested 4k7s so the bus may not run at high speed depending on the capacitance of the lines.
Personally I would just add the resistors.
As to whether you really need 470R on the line side, I don't know but why worry about it, just use them.
Rob