No u cannot justswap it. As the C-series (non-gze) speedo sender unit is different size to the E-series one.
You need to get an E-eries one. Then just swap them over. As long as they are E-series gear boxes.
I tossed out my electrical speedo sender from the ae101 box.
I put an AE92 GZE e-series mechanical speedo sender into my AE101 GZE e-series gearbox.
No probs