You should pretty much be OK, from my experience, anyways.
I pretty much did the same thing you did, only with Tokico HPs and I made the jump to Intrax springs, but like you plan to do, I kept the upper and lower insulators, the upper seat, and the insulator.
Just make sure the springs are properly seated in the bottom mount of the strut, otherwise you might get a thudding sound when you turn the wheel more than 90 deg.
I had that thudding sound for about 2 weeks, but at this point, the springs are pretty much settled in and the sound is gone.
Everyone else, feel free to add on your own tips and experiences