Can I ask about using my saddle on lesson horse?

I’ve just started riding again, the last 6 months or so, when I can afford it. I’m still in school and put by what I can for lessons here and there just to be around horses. My new trainer is understanding of my financial situation and okay with the fluctuation in lesson regularity. But the lesson tack (which gets used on all the horses, not designated for each horse) is kind of rock hard and uncomfortable on the lady bits, and tailbone which I injured riding approx 8 years ago.

Is it reasonable to ask my trainer to have a look at my cushier saddle and see if it fits the lesson horse(s) and if so, allow me to use that instead? We normally have to use risers and different pads to make the saddles fit anyway and it’s not always super reliable which ones are left if other people are also riding.

I know she’s already being generous allowing me to stay on the roster despite irregular income, so I don’t want to push too far. Would just appreciate an another opinion before I ask her.