Hi guys

I wanna change my suspension fork for a corrected fork.
So my actual fork has 475mm axle to crown and the corrected fork i am looking to has 440mm.

So i am asking, does the 35mm difference is normal when going from suspension to rigid fork?
Will it change something in my posture, may i get sore back?
Should i get a different stem, with bigger angle to lift me back to my initial posture?

Thank you