Steering racks on rack on racks man

[M.fate]

Quick question. I have two ps racks one is much bigger the the other? I'm wondering what's the deal? Did toyota beef them up at some point? Do I have some random rack?

The larger of the two came as a bunch of extra part I got with a coupe I got a few years back. They both have the same width and same OD on the bushing just one is thicker and a fair bit more robust!

Thanks
Sean