First, create the identical table in the "new" database.
Then run something like the following:
SET IDENTITY_INSERT TableName ON;
Use dbname_db;
truncate table TableName;
insert into TableName (FieldListHere)
(select FieldListHere from dbname_2_db.dbo.TableName)
SET IDENTITY_INSERT TableName OFF;
Note1: ALL FIELDS MUST BE DEFINED.. a * will not work.
Note2: TRUNCATE TABLE requires certain permissions (see Books Online), and won't work if the table is referenced by foreign keys. In this case, you can use "DELETE FROM TableName".