On Harmony, of course you have to use PAL60 since PAL60 has the PAL color codes. The TIA has two different palettes for the hexa codes, the only difference between the two versions are these codes.
On Stella, you have to set the game type manually (Options >> Game Properties >> Display >> Format) because it detects 262 scanlines as NTSC by default (PAL has 316, so it can easily tell that is PAL (or PAL50)).
first, thank you for the work you put into this. It's very atmospheric. I can feel the tension!
Just one bit of feedback: both my Harmony and Stella detect the PAL 60 as being NTSC. So to get the correct colours, with Stella I need to use the NTSC version, and on the 2600 with Harmony I need to use the the PAL 60, since the colour shift will make the orange I see in Stella appear yellow, thus correct. Thought I'd mention this, because maybe this is a simple declaration in the program that's missing? I don't have a clue how this works.
Not a biggie anyway, since the desired effect is achieved. I just need to keep both versions