Yeah getting two pieces that are the correct thickness is key if it can be viewed from both sides.
I get most of my hardwoods from Kim Oberlin on ebay or from ocooch hardwoods.
They’re both really consistent thickness, which is nice. If you ever want to do inlayed layered boxes, you cant have any difference in thickness at all… In fact, no matter what I sand them smooth before layering. Like this one: