There are three different models that look identical on the outside, so you have to read the product descriptions carefully and check the model numbers.
This one (YRD256ZW2) will work with SmartThings. It uses Zwave plus to communicate.
This one (YRD256iM1) will work with HomeKit. It uses Bluetooth to communicate.
The new “Connected by August” model (YRD256CBA) allows the Bluetooth lock to communicate to the August Wi-Fi bridge, but it doesn’t have Zwave support so it doesn’t work with SmartThings
In all cases, the last three numbers, 619, are the color code for the case: satin nickel.
So you either get a lock that works with smartthings or you get a lock that works with HomeKit, but not both in that particular model line.
The only lock I am aware of that can work with both smartthings and HomeKit at the same time is the August pro three, and then only if you get their additional bridge device, called Connect.