Why Do Knifemakers use Mammoth Ivory Media

Why is Mammoth Ivory used on custom knife handles and how it is different than Mastadon Ivory?

Here are 3 example of knives currently available at Robertson's Custom Cutlery featuring Mammoth Ivory:

Steve Randall Forged Damascus Bowie
https://www.robertsonscustomcutlery.com/product/steve-randall-forged-feather-damascus-bowie-ii/

Brad Zinker Damascus Urban Barlow Folder
https://www.robertsonscustomcutlery.com/product/brad-zinker-damascus-urban-barlow-folder/

David Broadwell 40th Anniversay Sub-Hilt Fighter
https://www.robertsonscustomcutlery.com/product/david-broadwell-40-anniversary-sub-hilt-fighter/