No, not quite correct...

DATA and EPROM are compiler directives that create EEPROM contents at COMPILE TIME only. Those values will be burned into your HEX file and loaded into the chip when you program it. So yes, DATA and EPROM are the same as alper queried. I believe it was included to maintain compatability with BASIC STAMP - but don't quote me on that as I've never played with STAMP.

Use the WRITE command to alter those preset values thereafter during program execution.