Pictures have a funny way of changing colors of wood. The second pic looks like totally different peices than the other pics. Knowing the true color of the wood will help a lot in knowing what it is.
Judging by grain & amber/pink color, it could be a anything from afzelia to mesquite, as mentioned. It's not thuya burl. There are a thousand woods that look just like the second pic, which i'm assuming is the closest to natural color. Cinnamon, cedar, juniper, maple, elm, alder, box elder, even pine look like that in burl form. I have seen some rosewood burls that look very much like it. Could be anything. Burl woods are unpredictable & can take any form or color, no matter the species. All that said, my blind guess will be dalbergia stevonsis, AKA honduran rosewood.