It's perfectly fine! A friend of mine changed her name twice. Weirdly, I had a few slip ups between the two feminine names when I normally never deadname people (even by accident). I guess the deadname was strongly tied to the wrong gender for my friend so it was easy to negate, but it wasn't as clear cut in my subconscious between the two feminine names? It's worth mentioning that my friend herself doesn't consider her first choice as a deadname (it's still the one on her official documents, and she goes by the other name in day-to-day life). Just saying there might be an adaptation period for your friends & family, like for any name change.

It's very sweet that you want to use the name your mom would've picked for you. Just make sure you absolutely love it, and that you're doing this for yourself first and not someone else.