You don't have to transfer your account.
You'll be able to use Sketch on your new device by entering both your pixiv ID (or your registered e-mail address) and your password.
If you don't know your account information, please contact us.
Inquiry form:
However, data from unfinished drawings will not be transferred.
If you want to transfer it, we ask that you post the work privately before changing devices, save the image on your device, and then transfer it to your new device. Layers cannot be transferred.