Mike, That is definitely not the same rope. DO NOT trust your life, or any one else's life, with that rope from HF..
That rope from harbor freight is polyester braid with a cheap fiber core. It is not shock load rated and is not designed to arrest a fall.
The HSS rope is braided nylon and is rated as a dynamic load rope and is designed to stretch when it comes tight so it won't break your neck.
You are going to exert far more than 300 pounds on that rope if you ever have to use it as a fall arrest rope.
Assume a 200 pound man falls six feet and is stopped by a safety harness rope. When his fall is stopped by the rope he is exerting 2600 pounds of force on that rope. Do you really want to trust you life to that cheap $3.00 rope from Harbor Freight?
Force = Weight x ((Free Fall Distance/ Stopping Distance) +1) or
Force = 200 x ((6/.5) + 1) or
Force = 200 x (12 + 1) or
Force = 200 x 13 or
Force = 2600 pounds
Use the HF ropes for what they were designed for. Lashing stuff down in the back of your truck, hanging a deer, hanging elk or moose quarters, etc... etc.... Not saving your life when you fall from a treestand.