From what I can make out from your photos, you can cut off the double ISO plug from old WinCE harness (pic 3). Then cut off the large black 40 pin plug from harness that came with new stereo (pic 2) and join wires together in colour order using bullet connectors.
One ISO plug is for speakers (8x wires), and the other is power/ground (red, yellow, black etc).
Now cut off red plug from your old WinCE loom (pic 3) these are the steering wheel controls. Use the two wires coming from red plug and connect to the two SWC wires coming out of new stereo harness (SWC from new stereo will be labelled either on stereo or in instruction manual).
You should end up with new stereo harness having the double ISO plug from old WinCE (power & speakers), and the red ISO plug with the two SWC wires (green & black) connected.
Your car harness grey and brown ISO (pic 1) plugs into double ISO connector, and your blue/green/yellow plugs into red ISO connector.
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