They are nothing alike. I was an OG TKF user. I never did fall in love with it but it felt good when I could send a few bombs.
The TKFE has a different balance point, different flex on the shaft, waaaay smoother to use, mishits are also not so wooden plank feeling.
I use TKFE as my main. I am almost fully used to it. I’ve been hitting with it for about 6 months (2days a week) so it’s finally starting to shine a bit more with my muscle memory.
Where as I used the OG TKF for a year and it never felt natural for me.