cant tell if they are different metals or not. one wire is yellow one is red. metal looks the same in both wires.
Go here and order PR-K-24-25 in the part number builder at the bottom of the page for ~$17 plus shipping. The color codes will match and 25' of wire should be enough. It is el-cheapo wire, but your splice will be outside of the engine compartment, so it should work well.
Remember, red to red, yellow to yellow.
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