They are not.

Double spend is when the code does not verify transactions properly allowing the same tokens to be used two or more times. In this case, it appears a transaction was sent to Binance, a new copy of that transaction sent with higher gas fees, and Binance should have verified the transaction as the same but instead it considered them as unique, but some how didn't verify it was valid.

A 51% is when you own enough of the network to take control and do whatever you choose to do.

The situation I wrote about is bad validation code causing a local balance error (on Binance's own wallet).

Posted Using LeoFinance ^Beta