I've seen people do this before. some of us are okay with it, some are not. I've often had clients refuse to match my donation to my duo partner, and I accepted it because I didn't want to lose the opportunity to do a duo since I really enjoy them.. but it's really ideal to match the rates. you are also mentioning different options. Once, I had a duo with a provider who had a PSE option. I assume the client saw that because he treated her very differently from me, he matched our rates (her GFE rate was higher than mine) but he did not pay for PSE.. He was a lot more rowdy with her and it made me really uncomfortable. I think it's important to discuss everything with both duo partners.