Hi stop-meaning,
In one setting, you are in ACES (2024); in the other, you are in sRGB (2025). In the 2025 version, the default is sRGB. But there is ACES tone mapping set up. I am not on my computer, as I am this week at the Maxon Summit. Tone mapping means, to get greater values than 100% into the file (even if they don't exist!), the space for them is created by squeezing the 0-100% values and creating some space for them. Hence, the initial 100% is lower. Please choose what you need. But just sRGB as render space and ACES used here as tone mapping sounds wrong, going by your target.
I am back next week, and I will look into it. Sorry for the delay. (Typically I answer even during my time off, but this week is packed, of course all to make everything better.)

Cheers

Hi stop-meaning,

Copying and pasting the data into a new file is always a clever idea. When something feels weird, however, check the cache path.

I will have another look next week; I am at the Maxon Summit, sorry about the delay.

All the best