You never have 2 NVIDIA drivers installed. Ever. On any OS. Under any circumstance. It is not possible.
NVIDIA drivers are architecturally unified. This doesn’t meany any driver installer package will work with any GPU, but it does architecturally support the idea that you can only have 1 driver, properly installed, at any given point in time. The way to support multiple GPUs is having that one driver do the task.
If you’re looking for a package that demonstrably supports dissimilar GPUs, I usually recommend the drivers that are bundled with the CUDA installer packages. Those drivers are designed to work on a wide range of GPUs (essentially all GPUs extant at that time).
With a few limited exceptions, NVIDIA generally doesn’t recommend the use of dissimilar GPUs in the system, and functionality is not guaranteed. For example GPU P2P will not work between those 2 GPUs. You’re welcome to do as you wish, of course, and I fully expect that you would not “damage” anything, but of course I can’t and don’t offer guarantees over the internet. I regularly run rigs with multiple dissimilar GPUs. In my view it works fine. But that’s not a statement of support, guarantee/warranty, etc. It’s merely an observation. If you’re concerned that you may damage something in your PC, don’t open the case.