yep the rowid changes

Code:
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.5.0 - Production
With the Partitioning, Oracle Label Security, OLAP and Oracle Data Mining options
JServer Release 9.2.0.5.0 - Production

SQL> create table t (dummy varchar2(20));

Table created.

SQL> insert into t values ('1');

1 row created.

SQL> commit;

Commit complete.

SQL> select rowid from t;

ROWID
------------------
AAAMYNAABAAAJ5CAAA

SQL> alter table t move;

Table altered.

SQL> select rowid from t;

ROWID
------------------
AAAMYOAABAAAJ5KAAA  (slight change)

SQL> alter table t move tablespace libra_data;

Table altered.

SQL> select rowid from t;

ROWID
------------------
AAAMYPAAVAAAEbsAAA  (bigger change)