Are you going to replace the G13 with G12evo when you replace the reservoir bottle?
I was servicing the brakes, including replacing the rear pads on my daughter's May 2019 Leon Cupra, I meant to check the coolant with some "test strips" that I have, really just to make sure that the PH level was still okay as it should be as it has one of these silicate loaded reservoirs, but I forgot to bring the test strips out with me to the garage, and her time was tight, so I just topped up the coolant with neat G13, I should try to convince her to change to that non silicate reservoir and change to G12evo in the spring time, I'll use your info on which version meets that criteria, if or when she agrees that doing that is a good enough plan!