dsPIC30F - Silicon versions (?) and system integration registers
The map of configuration registers is not the same on each chip.  You apparently found two documents that refer to two different register maps.  Note that the family reference manual, for example, has different chapters for different variants of some peripherals.  You have to know which variant your particular chip is using.

The right way to determine all these things for any one chip is to look in the datasheet for that chip.