I hope the custom made inserts work out for you. I know how much you love the Rolandos. You are lucky to have all the other ones you have.
...or too big. You'll look disproportional wearing shoes one whole size bigger not to mention how impossibly uncomfortable it will be walking in high heels that don't fit. Gotta look nothing less but gorgeous wearing those.I'd return them both..if thats not an option then keep the 40s! Nothing worse than a shoe thats too small.