Here is a post I made on a diesel forum a couple of years ago, it shows the differences between the two. I did a quick search on 42re valve bodies and judging by the pictures they are very look very similar to the 47re. Again, these pictures are of a 47re valve body, but should be close to the 42re.
On the 96-99 there is a C-clip on the inside that holds the governor sensor on place, while the bracket holds it in place on the 00-02's.
Governor Solenoid (same on all 47RE's)
the bracket that you will need off your 01 valve body (holds the governor solenoid in place and on the 00-02 it also holds the governor sensor in place, which is why you need it)
OD and Lock-up solenoids
On the 96 valve body
-unplug the governor sensor and solenoid
-remove the bracket and governor solenoid
-remove the C-clip holding the governor sensor and remove the sensor
-unbolt the OD/lock-up solenoids and the harness (all one piece)
-get the bracket off the 01
-use new sensors/solenoids and put everything back together using the 96 vb and the 01 bracket.