Provided these are the right connectors, Truenas will have no problems finding the drives. Do note there are several Mini SAS connectors available that are not interchangeable! So make sure you have the correct connector on the end!
Should probably work fine, i have SAS to 4x SATA in my old supermicro server running normal sata drives on that too, if i remember correctly SAS controller will run both SAS and/or SATA drives. What wouldnt work would be SAS drive in a SATA enclosure