Could I sub full-fat greek yogurt for the sour cream/creme fraiche called for?

I haven't made this particular recipe but I never buy sour cream or crème fraiche (I couldn't get crème fraiche here even if I wanted to). We make plain greek style yogurt routinely and I use that instead and have never had any issues.

I've not done it, but I think it would work. If you give it a go, let me know how it turns out :-)