Hi @joelvis, thanks for your query. You are correct that both the 4C and Nano Pro operate using different SDK’s.
The Tobii Pro Nano is designed to operate with the Tobii Pro SDK (https://www.tobiipro.com/product-listing/tobii-pro-sdk/) however the Tobii Tracker 4C can also work, but this requires the purchase of a special analytical licence and unlock file to do so.
You can read more about this licence @ https://analyticaluse.tobii.com/ To receive a quote for purchase, kindly send an email to [email protected] and the team there can deal with you further.
Hopefully this answers your query, please let us know if we can be of any further assistance.