LaughingCrow's suggestion is spot on. Every clone is a unique representation of the original. The directing aspect is not a consideration. In writing, you are making a distinction in identity. The clones could be in the same room or in separate areas. Acting is the director and actor's responsibility. As a writer, you shouldn't be thinking about the actor or directing but the story.
It's easy to just label them: CLONE #1, CLONE #2, etc.
If you're going to have frequent interactions, you could add a descriptor:
KNIT CLONE, JOCK CLONE, GUN CLONE, NERVOUS CLONE
If your clone takes on a name at some point, you can make that transition.
CLONE #2 --> CLONE #2 (LOUISE) --> LOUISE
in the case of multiple identities where the viewer sees the transition
CLARK KENT --> CLARK KENT (SUPERMAN) --> SUPERMAN or CLARK KENT
Even though these are the identically appearing persons, the name is an anchor for the identity. The label is used for the viewed identity.
As a reader, I've never found it easier or more difficult to follow a name versus a numbered name. When you introduce too many characters, even with names, it's bad form and requires thumbing back to figure out who is who. I appreciate TWB's comment. If you have several pages of going back and forth between the clones, it might get confusing. Their actions and dialogue (voice) should help distinguish them.
It's very dependent on the scene. The audience isn't going to see the name, so it's really just an artifice for the director and actor. Using CLONE 1, CLONE 2, etc. is perfectly fine. If it helps to give them names or descriptors, that's fine as long as you're consistent. This even happens with different characters with the same name: 9TH DOCTOR, 10TH DOCTOR and 11TH DOCTOR. They are all Dr. Who's so a distinction is made by their chronology. Using the actors' names would have been inappropriate.
As to the OP's original question, there are in the scene: PERSON, CLONE #1, CLONE #2 , etc. for as many as speak uniquely as dictated by the story. How it's realized on screen is not the writer's first concern. Script mods come later once the story is completed. If this is not the first time we've met the clones, or we'll see more of them later, then they may acquire names or descriptors as needed to distinguish them down the road. Good luck!