They are 2 seperate models Cz American & CZ Varmint you cannot get a American with a Varmint barrel, you do not need a heavy barrel on a HMR so i would go for the American of the 2 named, if i had the choice though i would go for the Style in synthetic/nickel good or all weather. I have a .22 American, cracking rifles.
The 'American' stock style is the same on the Varmint model.
I think it was a hint to get away from the 'ugly' stock on the standard lux and farmer.
Any how a spanking new heavy (short) barreled version was purchased at very reasonable cost! [£250 just over]