There's a family resemblance, but this doesn't surprise me.
For example, most car companies 'wind tunnel' their products. Taken to the logical conclusion, the outline would start to look similar as the 'magic profile' is approached.
In it's most simple definition, a knife has a handle on one end and the 'pointy part' on the other. If a truly ergo handle is sought, and the cutting geometry of that knife meets the same criteria, I think the knives would look like twins.