How long have you got lol? Karate is a generic name for a variety of styles rather than a style itself. Every style has it's differences, Shotokan has longer stances than Wado Ryu, the latter has a fair bit of Juijutsu in it, in Wado we 'do' knife hands and rising blocks a different way from Shotkan. that's just a couple of very basic differences, there's a lot more if you compare all the other styles with each other never mind TKD.
I do think TKD is very different from my style of Wado, it's a different way of moving, a different way of approaching techniques. this is a long watch but includes video of our Founder. Hopefully you can see differences?
This should be a very interesting discussion thread though, I don't know the difference between many of the karate styles though I believe Shotokan is the closest to TKD, not sure but I am sure someone will put me right.