There was a gap but 2x seems kinda too much. That is legit one shot territory.
Even 20% is total stomp. And Afaik goku could fight back and hold his own
We know that this version of cell is stronger than vegeta so that means he is also stronger than goku. However, Piccolo called cells kamehameha pathetic. Can Goku win the kamehameha struggle seeing as his Kamehameha has higher amp?