The pogo stick mounts are are different width. I'm trying to remember, but I believe the older style mounts are narrower. So you should be able to use the newer skis, but you would have to put some shims in.
It looks like from comparing the pictures from a 96 and 97 v-max ski, the 96 mounts lower in the ski and the 97 has a square base mount in the center that looks like it sits higher