It's true that the moderate high-frequency elevation of the MK 4 V is not designed into the MK 41 V, and that people shouldn't assume that a "V" capsule would inherently have this elevation. For a number of years Schoeps made a version of the MK 4 V (cardioid) available without the elevation--the MK 4 VJ--and when you think about it, the MK 6 and MK 8 are also "V" (vertical) capsules, and they don't have the high-frequency elevation, either.
But what's the source for the statement that the MK 41 and MK 41 V are the same capsule internally, and have the same frequency response? They don't have the same frequency response. (The MK 41 V has a slight dip in the upper midrange, for example.) They also don't have the same polar response at high frequencies. In the horizontal plane, which is the one plane most of us care about for stereo recording, a "vertical" or "radial" capsule presents a radially symmetrical surface to the sound field, while this is not the case for "front-facing" capsules.
--best regards
Edited in 2019 to add: More recent graphs of the MK 41 V's frequency response actually do show a mild high-frequency elevation, which wasn't shown in the earlier graphs.