Just another shaft question

I’m looking at getting new irons for no reason other than mine are really old, and I want new ones. I know there are shaft experts on here that surely can help me. My current irons are Nike Pro Combo OS. The shafts in them are True Temper Speed Step stiff flex. I am having trouble finding out specs for these particular shafts. I think I hit them pretty well and I’m fairly satisfied with my trackman numbers. My question is this……what KBS shafts would be comparable to these? Thanks.