I tried to make a pair of foldback mittens, but accidentally made the tension on the second one higher than the first. At a glance there isn't a visible difference between the two, but when I put the second one on, it feels a bit tighter and the part that folds over the fingers doesn't sit quite right. The Internet suggests I might be able to fix it with blocking, but a friend who knits says I'd probably be better off undoing the whole thing and redoing it.
images:

(for some reason this photo makes the second one look longer, but it isn't)

The yarn is Studio Chunky from Neighborhood Fiber Company, which the site describes as follows:
Super squishy Studio Chunky has a 6-ply construction that keeps pilling to a minimum. Perfect for heavier weight sweaters and cozy accessories.
100% Superwash Merino
125 yards/4 oz
3-4 sts/inch US 9-11
The crochet hook I used is a size 9/I. I've both lost the original pattern and modified it, but if it's relevant I can write it out.
What should I do?
images:

(for some reason this photo makes the second one look longer, but it isn't)

The yarn is Studio Chunky from Neighborhood Fiber Company, which the site describes as follows:
Super squishy Studio Chunky has a 6-ply construction that keeps pilling to a minimum. Perfect for heavier weight sweaters and cozy accessories.
100% Superwash Merino
125 yards/4 oz
3-4 sts/inch US 9-11
The crochet hook I used is a size 9/I. I've both lost the original pattern and modified it, but if it's relevant I can write it out.
What should I do?