Yes. One is CRSC and one is CRDP. There are differences
She thought she was going to get axed by her new supervisor so she said she hit her head on a cardboard box and went home and never went back. She had surgery to fix a bulging disc in her neck, and eventually achieved 100% total and permanent disability by gaining about 100 pounds combined with a whole lot of whining. When she comes to visit have to push her around in a wheelchair except when she wants to climb our stairs in the middle of the night to satisfy her kleptomania fueled urges to rifle through our stuff.
I went off service after 25 years with money contributed into our retirement fund by the participants. I was starting to have stress related issues. I get 50% less than my sister-in-law and could have gotten more if I used her tactics and claimed a disability. And believe me I have plenty of aches and pains... some from mishaps during my career. Some of my co-workers went off 100% disabled after jumping through plenty of hoops with doctors and others. A few eventually got themselves in trouble when video was taken of them playing soccer, water skiing, carrying bundles of shingles around while roofing, and various other activities that most people would not consider to be appropriate for disabled folks.