Is the procedure for filing a "corrected" 1040 return different from an "amended" return?

If an error is detected on a recently e-filed 1040, and we wish to correct it PRIOR to the due date of the return, can it be e-filed once again as a "corrected" return (i.e., will the IRS accept a second e-filing of the taxpayer's return?), or must it instead need to be paper-filed as an amended return?