Index: flang/include/flang/Semantics/type.h
===================================================================
--- flang/include/flang/Semantics/type.h
+++ flang/include/flang/Semantics/type.h
@@ -109,6 +109,7 @@
   bool operator==(const ParamValue &that) const {
     return category_ == that.category_ && expr_ == that.expr_;
   }
+  bool operator!=(const ParamValue &that) const { return !(*this == that); }
   std::string AsFortran() const;
 
 private:
@@ -299,6 +300,9 @@
   bool operator!=(const DerivedTypeSpec &that) const {
     return !(*this == that);
   }
+  // For TYPE IS & CLASS IS: kind type parameters must be
+  // explicit and equal, len type parameters are ignored.
+  bool Match(const DerivedTypeSpec &) const;
   std::string AsFortran() const;
 
 private:
Index: flang/lib/Semantics/check-select-type.cpp
===================================================================
--- flang/lib/Semantics/check-select-type.cpp
+++ flang/lib/Semantics/check-select-type.cpp
@@ -136,7 +136,7 @@
       if (const semantics::Scope * guardScope{derived.typeSymbol().scope()}) {
         if (const auto *selDerivedTypeSpec{
                 evaluate::GetDerivedTypeSpec(selectorType_)}) {
-          if (!(derived == *selDerivedTypeSpec) &&
+          if (!derived.Match(*selDerivedTypeSpec) &&
               !guardScope->FindComponent(selDerivedTypeSpec->name())) {
             context_.Say(sourceLoc,
                 "Type specification '%s' must be an extension"
Index: flang/lib/Semantics/type.cpp
===================================================================
--- flang/lib/Semantics/type.cpp
+++ flang/lib/Semantics/type.cpp
@@ -201,6 +201,29 @@
       const_cast<const DerivedTypeSpec *>(this)->FindParameter(target));
 }
 
+bool DerivedTypeSpec::Match(const DerivedTypeSpec &that) const {
+  if (&typeSymbol_ != &that.typeSymbol_) {
+    return false;
+  }
+  for (const auto &pair : parameters_) {
+    const Symbol *tpSym{scope_ ? scope_->FindSymbol(pair.first) : nullptr};
+    const auto *tpDetails{
+        tpSym ? tpSym->detailsIf<TypeParamDetails>() : nullptr};
+    if (!tpDetails) {
+      return false;
+    }
+    if (tpDetails->attr() != common::TypeParamAttr::Kind) {
+      continue;
+    }
+    const ParamValue &value{pair.second};
+    auto iter{that.parameters_.find(pair.first)};
+    if (iter == that.parameters_.end() || iter->second != value) {
+      return false;
+    }
+  }
+  return true;
+}
+
 class InstantiateHelper {
 public:
   InstantiateHelper(Scope &scope) : scope_{scope} {}
Index: flang/test/Semantics/selecttype01.f90
===================================================================
--- flang/test/Semantics/selecttype01.f90
+++ flang/test/Semantics/selecttype01.f90
@@ -186,6 +186,24 @@
   end select
 end
 
+module c1162a
+  type pdt(kind,len)
+    integer, kind :: kind
+    integer, len :: len
+  end type
+ contains
+  subroutine foo(x)
+    class(pdt(kind=1,len=:)), allocatable :: x
+    select type (x)
+    type is (pdt(kind=1, len=*))
+    !ERROR: Type specification 'pdt(kind=2_4,len=*)' must be an extension of TYPE 'pdt(kind=1_4,len=:)'
+    type is (pdt(kind=2, len=*))
+    !ERROR: Type specification 'pdt(kind=*,len=*)' must be an extension of TYPE 'pdt(kind=1_4,len=:)'
+    type is (pdt(kind=*, len=*))
+    end select
+  end subroutine
+end module
+
 subroutine CheckC1163
   use m1
   !assign dynamically