The 1lbs and the standard 20lb tanks do not have the same connections FYI. The 1lb tanks have a small threaded connection. They do sell adapters https://www.amazon.com/GasOne-Propane-Adapter-Converter-Certified/dp/B073KV4WLJ but they are definitely not the same connection.

Blackstone sells a 20# to 1# adapter hose, but they seem prone to failure.

This one works well: https://www.amazon.com/gp/product/B073KV4WLJ