### Godot version

4.0.2.stable.mono

### System information

Windows 10 - 4.0.2.stable.mono - Any Renderer

### Issue description

In a script with an `@export` variable (with a non-default value), Godot will replace the first variable in the category with the same name. For example, if you're exporting a variable called "Vector", and the value is set to a non-default value, the first variable in the category called "Vector" will also be changed to the same value.

### Steps to reproduce

Attach said script to a node:
```
extends Node

@export var Vector: Vector2
@export_category("Vector")
@export var Var2: float = 1

func _process(delta):
	print(Var2)
```
When changing the value of the `Vector` export variable, the variable Var2 will contain the same value. This does not happen when the `@export_category` has a different name.

### Minimal reproduction project

N/A
if (type_source == UNDETECTED || p_other.type_source == UNDETECTED) {
				return true; 
			}
			if (type_source == INFERRED || p_other.type_source == INFERRED) {
				return true; 
			}
			if (kind != p_other.kind) {
				return false;
			}
			switch (kind) {
				case VARIANT:
					return true; 
				case BUILTIN:
					return builtin_type == p_other.builtin_type;
				case NATIVE:
				case ENUM: 
					return native_type == p_other.native_type;
				case SCRIPT:
					return script_type == p_other.script_type;
				case CLASS:
					return class_type == p_other.class_type || class_type->fqcn == p_other.class_type->fqcn;
				case RESOLVING:
				case UNRESOLVED:
					break;
			}
			return false;
		}
		bool operator!=(const DataType &p_other) const {