I write from Spain. My English is a little bit rusty, but I'll try to explain myself.
I sell medals in my web. I use the MSPC to set up the purchase between three different options. The material (I put this as three different products: gold, silver, bronce), the sport (54 variations) and finally the ribbon (16 variations). With the ribbons I don't have any problem when I replace them, but with the sports (the whole medal aspect changes, but not the size or shape) when I choose an option, appears smaller than the main medal and I don't know why...
The pictures I used are exactly the same in size and resolution.
I hope you can help me with this issue.