I don't know about the fuel injected WR's but the earlier aluminum frame versions compare to the 500 KTM.
Maybe less on the bottom but a little more on the top.
The KTM 500 I rode was very torquey but hit the rev limiter down low.
On monster power hills the 450 KTM is lacking in HP.
Yes, my uncorked 500 was very torquey, but slow. It just ran out of power on a regular basis.
My stock un-corked WR would out accelerate it from 2nd gear on.