Replying to Mounting READ!!

so, i had a pair of scratch 200 bindings on my invaders, and i toasted them a week ago. So i bought a pair of px12 ti's and wen to the shop to get them mounted as I'm going skiing on Friday. so i get there shops closed and I'm freakin out. So i get home and notice the holes are in the same places for both bindings. So i took of the old ones put on the px12's and everything seems to be fine. i adjusted to my sole length and adjusted the din. Does anyone see a problem with what i did ? and should i have just waited and or am i forgetting something ?