Is emergent mcdonald 3 stitches as successful as elective if cervix is not dilated or effaced at all,just 21mm funnel and cl 23mm.no bulging membranes?

No: What's different about the situation you describe is that there has been cervical shortening, which, in and of itself, increases your risk for preterm delivery. Your cervix is still pretty long, though, at 23mm. Likely the stitch will be successful at helping to prevent preterm birth. It's good, as well, that no bulging membranes. Good luck and I hope that your pregnancy goes to term!