Don't know about resizing but don't delete them- just put them in a someday a bigger machine folder. You never know what the future could bring. Never thought I would get a 6x10 but it came my way and I love it.
You can I believe re-size up to approx 20% smaller without too much problems. Why not try it and embroider on scrap of material to try. Please let us know how you got on.