Of course they are completely different, because the Bitcoin lightning network is a second -layer to the Bitcoin Blockchain. Also, this lightning network is faster compared to Bitcoin, and also cheaper compared to fixed cost bitcoin.

       And in the lightning network the process is fast while in Bitcoin it is not, but it will take a few minutes before the confirmation when it comes to the matter of Speed. Although the lightning network is currently still under development, it has the potential to change the way bitcoin is used.

** https://cointelegraph.com/learn/what-is-the-lightning-network-in-bitcoin-and-how-does-it-work