What you have will work both ok and fine. The ok part is for the 5645 because they don't center as well as they could, but they are fast with a lot of torque. The fine part is for the 5945. Don't plan on any knife edge loops with that servo unless you do everything perfect, but for just about anything else it will work great.

I don't know about the pricing on your continent, but if it was possible to exchange the 5645's for 5925's without a bunch of cash exchanged, or hassle, it would work better.