I am looking for ONE brush that I could use for contouring and applying foundation…I am considering MAC 165 (or 109) or the blush brush from urban decay…Which one do you think is better?

I don’t own a foundation brush so i’m wondering is it okay to just use my blush brush to apply loose powder over my face?

Will it work just as good?

i accidentally bought a powder brush instead of a blush ones. are there any significant differences? Thanks!