Actually that is the main problem. Like you give nt exact kv values the producer of these motor don't give winding numbers. There is only this information on the product page for 6900kv motor if it helps :This motor is best compared to a 6T brushed motor on steroids, with none of the brushes or comms to ever wear out
For 7700kv motor they say: The 7700Kv motor is roughly equivalent in top speed to a very good 5t to 7t brushed motor on 6 cells