SQL & PL/SQL

i have a table called P.
P is partitioned by range on a date column.
this is my script

create table t_p_1 as select * from p where 1=0;

alter table p exchange partition p_1 with table t_p_1
excluding indexes without validation;

i'm keep getting

ORA-14097: column type or size mismatch in ALTER TABLE EXCHANGE PARTITION

i chacked for unusable columns (non) , no constraints nor indexes on any of the tables. i also compared data_type , data_length , data_percision and nullable at user_tables. all EXACLY the same.

what could possibly be the mismatch ?

Thanks !