One mistake people commonly make is that they assume independent discovery is difficult. When you look at the seminal inventions of prehistory, independent rediscovery is the norm, not the exception: agriculture was developed no fewer than 9 times, writing about 3-5 times, urban civilization at least 6. Pyramidal structures themselves are evident in most ancient urban civilizations without much evidence of direct transmission to or from Egypt.
It's not sufficient to just say "this looks similar." You have to explain how the designs were transmitted, what else was or wasn't transmitted, why evidence is or isn't present in supporting records such as contemporary accounts. There is very strong presumption against pre-Columbian trans-oceanic contact (based in part of our knowledge of ancient shipbuilding techniques and maritime practices), so you need a very high burden of proof here. Vikings and Polynesians are exceptions to the rule here because we know they were both able to make the journey, there's corroborating evidence that's multifaceted, there's explanations of why the contact was ultimately transient in nature, etc.
It's not sufficient to just say "this looks similar." You have to explain how the designs were transmitted, what else was or wasn't transmitted, why evidence is or isn't present in supporting records such as contemporary accounts. There is very strong presumption against pre-Columbian trans-oceanic contact (based in part of our knowledge of ancient shipbuilding techniques and maritime practices), so you need a very high burden of proof here. Vikings and Polynesians are exceptions to the rule here because we know they were both able to make the journey, there's corroborating evidence that's multifaceted, there's explanations of why the contact was ultimately transient in nature, etc.