Is this a Guinea Fowl egg or is it just abnormally small?

I’ve raised chickens for about two years, and we recently bought five Guinea Fowl and 21 other various types like Plymouth Rocks, Easter Eggers, etc. the tiny egg in the middle is the first one we got, the five near it were later, and the ones at top were from our original chickens. Idk if the tiny one is a Guinea Fowl egg or not or if it was just a first time lay thing.