Pertaining to your question about which one is bigger inside, here's a site where you can see the comparisons side by side as it pertains to dimensions ...I've chosen to link the comparison between the
2005 CR-V and Liberty. It appears that the CR-V is slightly bigger in just about every measurement but not by too much --go down to "Interior Dimensions" and the CR-V will be on the left and Liberty on the right:
Compare 2005 Honda CR-V vs 2005 Jeep Liberty
eta: keep in mind, however, that the 2000 and 2001 CR-V were part of the "first generation" and in 2002 they changed body-style a tiny bit. The first gen CR-Vs were just a hair smaller inside.