How to know the constructor of an object and compare with another constructor in F#?

Question

Functional programming

Suppose there is a type Type. A, A1, B, B1, B2, B, C are some types.
type Type = | Cons1 A A1 | Cons2 B B1 B2 | Cons3 C
And there is a function that takes two objects of type Type.
The function should return true if the object constructors are the same, false otherwise.
I couldn't find a function in F# to extract a constructor and compare it with another.
All sorts of manual enumeration of constructor combinations is too expensive in a real program, since there are many constructors.
Tell me if it is possible to implement this and if so, how, and if not, what workarounds exist.

Answer 1

Having learned the same constructors or not, I can judge that these objects are similar in their external structure, abstracting from the arguments.
Found a solution.

open Microsoft.FSharp.Reflection
let cons (x:'a) = ((FSharpValue.GetUnionFields(x, typeof<'a>)) |> fst).Name

Answer 2

To be honest, I can't imagine why this should be done in a functional language and how you are going to use the result. There will be a crutch on a crutch.
The easiest way is to make an interface and check whether its object implements something like this
let obj1 : obj = upcast (...)
match obj1 with
| :? ISomeInterface -> (do something)
| _ -> ()
Well, or just create a new "type" with goodies.
typeMixedType =
| Tup of int * int // a tuple
| P of Person // use the record type defined above
| L of int list // a list of ints
| U of IntOrBool // use the union type defined above
Well, under the word type in F # there are quite a lot of different things.