Thanks Sven.
It should be simple, but it won't. I open a case with Juniper this is what we did:
1. we had to change from policy based to route-based (dial-up)
2. We created 2 interface tunnels (unnumbered)
3. We were using Xauth, so we have to add the new ip pool to policy and tunnel
4. Create a untr-2-untr policy, enabling source NAT
It worked!!
This kind of configuration, it doesn't exit in juniper KB.
Thanks