YES ...They all interlock . Very hard to match up.You can try a whisk broom, use regular mud not the lightweight variety. I would practice on a piece of drywall and you'll have to mix it with water to find the right consistency.
I have this in my house only it's mixed with sand and it's perfectly symmetrical. You'll never match it perfectly, the pattern of the broom will be different.
Wow this took me back a few years, "white wash" have not done that in 40 years, that big old brush we called the "wallop brush" just wallop the walls son.I did one like that a few months back, I used the old "white wash" brush for painting worked close enough for me! The customer was happy, I was happy.