Following buses might seems to appear on other services but they are NOT the real perm/replacement.
TIB439B - 911
TIB490B - 900
TIB482A, TIB483Y, TIB486P - 962
TIB742A - 913
TIB767D - 912
TIB1139K, TIB1225U, TIB1228L - 903
and Random buses - 901.
They are either holiday replacement and mostly are temporary fleet add.