Hello Ricardo,
The VVX301,311,401,411,501 and 601 are the new hardware refresh and have different CPU / Memory layout.
At some point the current VVX phones will go end of sale and the "new" models will replace these completely.
The only other difference is that the VVX401/411 now has 1x USB port where the "old" 400/410 did not have any.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services