Hi Raychelle!
Thank you for bringing your question to the Disney Parks Moms Panel!
The only thing better than having one
Walt Disney World trip on your calendar is having two! Yay!
Your custom
Magic Bands will work for your October trip, as well. As long as they are connected to your My Disney Experience (MDE) account, they will have your information stored on them. If you have any trouble with them once you get there, simply ask a Cast Member to check them out and make sure they are connected.
You will also be receiving bands for your October trip for everyone on the reservation. You can actually decline the Magic Bands for anyone who doesn't need or want a new one from your MDE account. I have one that I use for each trip, so I have started declining mine for future visits. I feel like it's a waste to get one each time. Your husband can still receive his, though, even if you and your daughters decline.
I hope this helps! Please let me know if you have any other questions.