The At One is the AT One and the Pro Varmint is the Pro Varmint, the CZ 457 Varmint At One is a mix of the two only available to the CZ USA
I quite like the look of the two mixed together, as I see others do also. Hopefully it will be available from Boyds, but probably a proprietary item to CZ USA.
What differences do you see between the Boyds At One stock for the CZ 457 and the stock for the CZ 457 Varmint At One?
Boyds makes the At One stock for the CZ 457 Varmint At One. CZ itself says the CZ 457 Varmint At One uses the Boyds stock. The "Varmint" in the name identifies the rifle as one with the heavy barrel (Varmint) profile. The stock itself could be used with any CZ 457. If there a characteristic unique to the stock on the CZ 457 Varmint At One that is not found on the Boyds At One stock for the CZ 457 it would be more cosmetic than anything else.