Ranch packer is a angled heel (think cowboy boot) for riding horses. Not a cowboy boot roper heel (straight block heel) for stability on the ground for throwing ropes at horses. Standard White's heel is their Cuban curved heel (granny boot heel). Throw White's Boots into Google and click the images on the top of the page you will find a lot examples of all of the above mentioned heels. Good luck on your search.
Thanks. It was rather inchoate in my head, but when I saw 'Cuban curved heel' as the Standard heel and all the pics, it makes sense to me now.