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I think if the length is long enough then it should be fine.
I had the brake line upgraded first on my stock 1990 C4 brake kit front and rear.
Then later I upgrade to 964 turbo big red for front and RS for rear.
We use the same brake line from last upgrade despite the new brake disc are bigger.
Used 993 non RS calipers on mine and I did buy new brake hard lines but it looked like I didn't have to as they seemed exactly the same. Yours might be easier to determine, just check the PET for difference between turbo, c4 c2.
Thanks for replies guys I did look at PET and the rears look exactly the same. The fronts also look very similar. I think I’ll probably just get the 964 original hard lines.
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