Ok.
Knowing that information removes doubts about the device....
That's why I asked. So this is about making the sensors work on the same device -- it's not about project guidance.
Sorry I don't know where it is... where is this code???? Sorry if I missed it.
#Include <adns2620.h>
Looking at that code may indicate why it does not play nice with the other sensor... It might also give a hint as to how to use the other libraries with it.