>>104390
>>104404
The original JPEG standard doesn't define a color space. Different programs out there assume all sorts of different stuff in all sorts of situations. Different programs might interpret JPEGs as BT.709, BT.601, and sRGB, and change which they assume depending on the JPEG's resolution or some other heuristic, and different programs and hardware produce JPEGs in different color spaces. You can embed color space information in a JPEG to try to help, but few programs do anything with that information.
The same is true for PNG, but the standard itself is somewhat biased towards sRGB, and it has always been primarily used in home computers which are all sRGB, so in practice everyone assumes PNGs are sRGB.
The most significant difference between those standards is their gamma curves which handle how bright the output image which is precisely what you're noticing.
You can try converting from the possible color spaces to sRGB until it looks right and assume your raws use that color space, I don't really work with this stuff so I don't have a program to suggest.