Hello
Sometimes the damaged root will make the plant grow very slow for the next couple weeks, I'd say wait a week at least to see if it keeps up with the undamaged plant, if so..no need for a new seed. If it is growing much slower then you may want to give that one just a 1 gallon pot and then start up another seed.
If it weren't an auto I'm sure it would outgrow the problem, but being auto i would just watch closely for a week or two and then decide what to do. 👍