How important is the RC/IR Erratas?

Other Games SotM Game Engine
1

I only recently discovered that there are some Erratas for some cards I. RC/IR that came out in the combined box. 

I was just wondering how necessary are they to have? I just wNted to see if I have to spend money on replacements.

 

 

2

Page 28.

3

Thanks. Had a hard time looking for them.