A quick look at the HGST Ultrastar page
shows that only the 14 TB variant
comes with SMR and highlights it as a major feature, while the 4 TB variant
up to 12 TB variants don't have it.
When it comes to you ordering drives, if you compare the model number of the product you're shopping for with that on the HGST site, that should reassure you. Given that SMR is aimed at increasing data density, I'd expect it on only the higher capacity models anyway.
Is there some other concern you have that isn't addressed by the information on HGST's site?