2 Corrected typo, improved formatting
source | link
tl = {{True, False, m12}, {False, m22, m33}, {m32, False, True}};

Replace[tl, Except[True | False] :> xz, {2}] 

(* {{True, False, z}, {False, z, z}, {z, False, True}} *)
tl = {{True, False, m12}, {False, m22, m33}, {m32, False, True}};

Replace[tl, Except[True | False] :> x, {2}]
(* {{True,False,z},{False,z,z},{z,False,True}} *)
tl = {{True, False, m12}, {False, m22, m33}, {m32, False, True}};

Replace[tl, Except[True | False] :> z, {2}] 

(* {{True, False, z}, {False, z, z}, {z, False, True}} *)
1
source | link

tl = {{True, False, m12}, {False, m22, m33}, {m32, False, True}};

Replace[tl, Except[True | False] :> x, {2}]
(* {{True,False,z},{False,z,z},{z,False,True}} *)