Depends upon the length. These are handmade, and not cut from an assembly line, so the blades tend to vary not only between the Kamis, but each kami may make the same model a little differently.
I have two BASs made by the same kami. One is 20ozs, the other is 25. Both are in the 15" range.
I have two 15" M-43s, both are Kumar's. One is 25oz, while the other is 27oz, and a third that sold at about the same time period was 30oz.
A 5oz. variance at 15" is very noticeable.
I remember buying about 7 or so Randall #1s over the past 30 years. On more than one occasion, if I didn't know better, I would have sworn I had bought a different model. The grind and weight were just that different.