Neo Gold did a excellent restore and has the paint colours in this post, hope its ok to link another forum.
https://forum.arcadeotaku.com/viewtopic.php?t=45412&hilit=Konami+windy+restore
Are you playing it on a CRT? It’s pretty simple to tell if it’s 50 or 60 Hz,
50 Hz PAL will play in slow motion and have a letter box screen.
60 Hz will play full speed and full screen.
My guess it’s already been modded.
When you mod a PAL 50Hz SNES or Neo Geo to 60 Hz it’s a PAL 60 mod, and usually pretty simple.
To change a PAL console to NTSC involves changing crystals and perhaps more but it can be done 👍
If you just want to play games at the proper speed with a RGB scart cable, the PAL 60 mod is...