I wouldn't end a friendship with a mum bc of different parenting styles... unless it was something really extreme like beating her kids. Even then I would be reaching out to her to offer some support.
But I had a friend that parented polar opposite to me. She CC'ed. Put her kids to bed at 5pm for a break and expected them to stay there. Ironically I ended the friendship, not bc of her choices but the fact she judged *me* bc I didn't do the above, go figure. She would constantly criticise my parenting saying I was over anxious and over protective. Coupled with her interfering in my marriage, I couldn't handle it anymore.