With 'ConstructorInfo' from a constructed generic type, how to I get the matching 'ConstructorInfo' from the open type?

In .NET, I have an instance of ConstructorInfo. The declaring type is a constructed generic type (aka foo.DeclaringType.IsConstructedGenericType == true). I want to retrieve the ConstructorInfo instance that belongs to the open type - that is, the generic type definition of the declaring type.

It's straightforward to obtain the open type itself with foo.DeclaringType.GetGenericTypeDefinition(); however, at this point, there is no obvious way to get the matching constructor. I can re-enumerate all constructors on both sides, but then, I am still facing the problem of matching those two lists together; and I am not sure that .NET provides any guarantees that the constructors will be enumerated in the same order.

Does anyone has a way to obtain the original ConstructorInfo counterpart?