No you don’t need both ratings. However, it would be advised to have both. The reason is some aircraft have both floats and wheels and the PIC only needs the rating for land when landing on hard surface. I checked FAR 61.57 Recent flight experience PIC and 61.31 again. If you only have floats installed you are only required by FAR to have the seaplane rating. Again both rating would be much better.
Denny
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