It would still be about the same. The SU-30 can’t undo the disadvantages caused by it’s significantly larger dimensions (something shared with the F-15) or it’s lower thrust-weight ratio compared to the newer and lighter Typhoon.
I believe Su-30s would still have some overall strategic advantages (not necessarily in a one-on-one combat) because of higher payload, longer range and more fuel. And AESA, long range BVR, ability to launch cruise missiles from standoff distances and 3D TVC will effectively balance out whatever advantages the Typhoon may have.