JPA, How to use the same class (entity) to map different tables?

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Not sure you can do it exactly as you want but you can use inheritance to produce the same result.

AbsT has all the fields but no @Table annotation

Ta and Tb inherit from AbsT and have an @Table annotation each

Use 

@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)

in AbsT.

Sample code:

@Entity
@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
public class abstract AbsT {
    @Id Long id;
...
}

@Entity
@Table(name = "Ta")
public class Ta extends AbsT {
...
}

@Entity
@Table(name = "Tb")
public class Tb extends AbsT {
...
}

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