Wigs Question about changing a styled wig

Do you have any pictures of the two? Photos and maker links will really help us tell you what's workable.
It depends on a few factors, from material and method of construction, to styling products/glues used, to weft direction or even potential "gaps" in the wefting.
It's truly not possible to give you an answer from a written description.

 

It really does depend on the wig. Some wigs can be redone easily as you described, but some are cut or sewn to hold a certain shape.

Often times, assuming you have a heat resistant wig that isn't special cut, you can bring some water to boil, and then and dip a brushed out wig in and out of the heated water quickly combing through it to straighten the wig and give you a fresh base to work with. Once you have the fresh base you can then style a wig how you want.

Do you have any pictures of the wig that you want to restyle?

 

Unless the braids are sewn on separately, I think it would be feasible to redo. But if you are re-braiding anyway, why not get a wig without styling to start with? It would be a lot easier and come with less possible surprises.

 

I Think this would be pretty easy to redo.

I have a 1/8 doll with a similar wig and twin tails. I ended up pulling the higher twin tails down to lower ones like you are showing with the braid that you want to do. My dolls wig has a definitive sewn back part which makes it easy for twin tails and braids, but she would always have to wear a double braid or twin tails parted style because of how the wig is sewn in the back.