Assuming you are not upgrading, you can change planes as a new hire on the first AE that closes after your one year anniversary under two scenarios:

First, you can if the new plane you desire is in a different base AND your current plane is not based there

Second, you can if the new plan you desire is in a different base AND you bid your current aircraft in that new base with no restrictions AND you cannot hold your current aircraft in that new base but you can hold the new aircraft.

In either scenario the remainder of your new hire seat lock gets added to your new seat lock for changing planes.

In your specific example of getting the 320 assigned in indoc and wanting the 330, that is basically impossible to do until your 2 year new hire seat lock expires. The 320 is in every base, so scenario 1 will not apply. And for the second scenario, there is no situation where someone in the right seat of the 320 would be able to hold right seat on the 330 but not hold right seat 320 in the same base.

The last caveat is that the company can break any lock at their discretion, so bid whatever you want regardless of your seat lock, but that tends to be very, very rare so don't count on it by any means.