type matching, they talk about 4 cases but aren't the 2nd and the 3rd identical?

docs/csharp/language-reference/operators/patterns.md

@@ -47,13 +47,15 @@ You use declaration and type patterns to check if the run-time type of an expres
 
 A *declaration pattern* with type `T` matches an expression when an expression result is non-null and any of the following conditions are true:
 
-- The run-time type of an expression result is `T`.
+- The run-time type of an expression result has an identity conversion to `T`.
 - The type `T` is a `ref struct` type and there is an identity conversion from the expression to `T`.
-- The run-time type of an expression result derives from type `T`, implements interface `T`, or another [implicit reference conversion](~/_csharpstandard/standard/conversions.md#1028-implicit-reference-conversions) exists from it to `T`. The following example demonstrates two cases when this condition is true:
+- The run-time type of an expression result derives from type `T`, implements interface `T`, or another [implicit reference conversion](~/_csharpstandard/standard/conversions.md#1028-implicit-reference-conversions) exists from it to `T`. This covers inheritance relationships and interface implementations. The following example demonstrates two cases when this condition is true:
   :::code language="csharp" source="snippets/patterns/DeclarationAndTypePatterns.cs" id="ReferenceConversion":::
   In the preceding example, at the first call to the `GetSourceLabel` method, the first pattern matches an argument value because the argument's run-time type `int[]` derives from the <xref:System.Array> type. At the second call to the `GetSourceLabel` method, the argument's run-time type <xref:System.Collections.Generic.List%601> doesn't derive from the <xref:System.Array> type but implements the <xref:System.Collections.Generic.ICollection%601> interface.
-- The run-time type of an expression result is a [nullable value type](../builtin-types/nullable-value-types.md) with the underlying type `T`.
-- A [boxing](../../programming-guide/types/boxing-and-unboxing.md#boxing) or [unboxing](../../programming-guide/types/boxing-and-unboxing.md#unboxing) conversion exists from the run-time type of an expression result to type `T`.
+- The run-time type of an expression result is a [nullable value type](../builtin-types/nullable-value-types.md) with the underlying type `T` and the <xref:System.Nullable%601.HasValue?displayProperty=nameWithType> is `true`.
+- A [boxing](../../programming-guide/types/boxing-and-unboxing.md#boxing) or [unboxing](../../programming-guide/types/boxing-and-unboxing.md#unboxing) conversion exists from the run-time type of an expression result to type `T` when the expression isn't an instance of a `ref struct`.
+
+Declaration patterns don't consider user-defined conversions or implicit span conversions.
 
 The following example demonstrates the last two conditions:
 

docs/csharp/language-reference/operators/type-testing-and-cast.md

@@ -39,9 +39,9 @@ Where `E` is an expression that returns a value and `T` is the name of a type or
 
 The `is` operator returns `true` when an expression result is non-null and any of the following conditions are true:
 
-- The run-time type of an expression result is `T`.
+- The run-time type of an expression result has an identity conversion to `T`.
 
-- The run-time type of an expression result derives from type `T`, implements interface `T`, or another [implicit reference conversion](~/_csharpstandard/standard/conversions.md#1028-implicit-reference-conversions) exists from it to `T`.
+- The run-time type of an expression result derives from type `T`, implements interface `T`, or another [implicit reference conversion](~/_csharpstandard/standard/conversions.md#1028-implicit-reference-conversions) exists from it to `T`. This covers inheritance relationships and interface implementations.
 
 - The run-time type of an expression result is a [nullable value type](../builtin-types/nullable-value-types.md) with the underlying type `T` and the <xref:System.Nullable%601.HasValue?displayProperty=nameWithType> is `true`.