Does the second Non-O visa application supersede the first, or can both be used?

I’m currently living in Thailand on a non-o extension, my wife was still in the UK whilst we sold our house.

On 6 September, I applied for her 90 day Non-O which was granted on 16th September and is valid from 15th September through to 13th December. We’re bringing our two small poodles with us and we were having problems booking a flight to arrive before 13th December where we can bring the pets in cabin, we managed to find a flight which arrives on 11 December so I have two days of this visa window spare.

As a precaution on 15th of October, I applied for another Non-0 90 day, this was granted today and is valid from 13th November through to 10th February.

My question is does the second application supersede the first? Or can I still use the first? Not sure why I need the second now, but is a back up if our flight was canceled and we had to rebook.