You could probably buy either of the Amedeo adapters and use it on both lenses without noticing any difference for 99.8% of your shots. From what I read the differences between Nikon and Contax were generally noticeable with the longer focal lengths (85mm, 105mm, 135mm).
I have been searching for quite a while for one of the Amedeo Contax to LTM adapters to use with my Helios-103. He hasn't marketed that adapter for some time. I have settled, for now, on a Fotofox Contax/LTM adapter. While it does work it isn't anywhere near the quality of an Amedeo.
Here is the Helios, Fotofox adapter and Ektar 100 film on a Bessa R.
2020-02-05 Stage Bessa-R Helios-103 Ektar 100 000372310020 by
newst54, on Flickr