Strange you haven't received an answer to this question but the answer is generally no.
Your echo sounder sends out a signal through the cable to the transducer which you would know bounces back from the bottom of the water and then goes back to the sounder unit.
The sounder unit measures the time it takes and thus able to determine the depth of the water.
Everything has to be tuned to the echo sounder otherwise the signal will be too fast or too slow making the echo sounder miscalculate the depth.
However if the impedence of the cable and transducer are the same as the original it may be OK.
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