So, you want to deliver the production in 440Hz, right ? If so, this can be achieved in your soundcard settings (if the soundcard offers fine-tuning of the clock). Since you didn’t specify your sound card, it’s hard to tell. For RME this would be under the register card “DDS”, then tune the large slider to the corresponding FS. If you work in 44.1kHz, that would mean you needed to tune the FS to 44.400,7 Hz.
If they want to deliver it in 443, you don’t have to do nothing.