Isomorphisms of type A affine Hecke algebras and multivariable orthogonal polynomials

We examine two isomorphisms between affine Hecke algebras of type A associa ted with parameters q(-1), t(-1) and q, t. One of them maps the non-symmetr ic Macdonald polynomials E-eta(x; q(-1), t(-1)) onto E-eta(x; q, t), while the other maps them onto non-symmetric analogues of the multivariable Al-Sa lam & Carlitz polynomials. Using the properties of E-eta(x; q(-1), t(-1)), the corresponding properties of these latter polynomials can then be elucid ated.