We deal with adjoint commutator and Jordan algebras of isotopes of prime strictly (-1, 1)-algebras. It is proved that a system of identities of the form [x(1), x(2), x(2), x(3),...,x(n)] for n = 2,...,5 is discernible on isotopes of prime (-1, 1)-algebras. Also it is shown that adjoint Jordan algebras for suitable isotopes of prime (-1, 1)-algebras may possess distinct sets of identities. In particular, isotopes of a prime Jordan monster have different sets of identities in general.