KAAN is supposed to use the same engines in the F-15. It is a much larger aircraft.
Assuming the US lets them have the engines that is. Knowing US politics, Israel will find a way to prevent Turkey from having this aircraft.
KAAN is pipe dream as of now. May be in 10 years time something concrete may emerge.... Secondly, suitable indeginous engines neither availble nor will be available soon... US engines availability also a pipe dream... So KAAN is RIP atleast for 10 years...
Only sensible option for Pakistan is Chinese origin fifth gen...