Left: 470 right: 450. Too big or just right?

Thank you for sharing your question and photographs.  If your surgeon has measured your chest and assured you that the implants will physically fit, and you like the look when you try on sizers, I would feel confident in your choice moving forward.  Always wise to have extensive conversation with your surgeon to ensure you both are on the same page about your outcome.  Hope this helps.

Thanks for your question and the photos. Picking an implant size is perhaps the most anxiety provoking part of augmantetion surgery.  I find it helpful to allow my opatients to try on actual implants in a testing bra in front of a full length miror.
We focus on the balance of the curve of the breast with the curve of the hips and once we like the implants width we then look at different projections - high, moderate, low. 
I also find it helpful for patients to look with their own clothing- blouses, shirts and dresses.
Given your height the implants you are looking at are generous for your frame, but it is about your goals as well. High profile makes a statement- moderate can be dressed up or down. See if your PS can have you try on sizers to give you a sense of comfort.
I have included sizing faq in the link as well.
Best wishes.