Can I safely use these propane cylinders on a Mr Heater buddy heater?

Apologies if this is a silly quesiton; I thought propane was propane....until I started trying to research connection types and finding cylinders that would fit my heater. Can anyone please tell me if these would be safe to use? It's the mention on Propylene that's giving me doubts.

Link to cylinder: [https://directplumbingsupplies.com/product/salvus-propane-gas-cylinder-400g](https://directplumbingsupplies.com/product/salvus-propane-gas-cylinder-400g)

Link to my heater: [https://www.amazon.co.uk/Mr-Heater-F232000-Indoor-Safe-Portable/dp/B002G51BZU](https://www.amazon.co.uk/Mr-Heater-F232000-Indoor-Safe-Portable/dp/B002G51BZU)

Thanks in advance.