Winter Moths

I know this isn't just an ID forum (and am only too aware of putting experienced observers on the spot!). But in this, my first year of trapping, it's very tempting to use it as such.

These two were outside the trap on the wall a couple of nights ago. I pondered them long and hard. The left-hand moth is slightly larger and with a paler protruding hindwing and I considered Northern Winter Moth. In the end, I was undecided but having read the comments below thought I'd seek another opinion.....