The signs "but" and "different" are basically the same sign. The sign "but"
generally uses a "smaller" movement, however, it may be done quite large
depending on how excited the signer is. It is also very common to
fingerspell B-U-T when you mean "however."
BUT or DIFFERENT:
The sign for "but" is (in general) the same as the sign for
"different." However, I suggest that the sign for
"different" uses a larger motion (in general) than the sign for
Memory aid: "A small but(t) makes
a big difference." (Forgive me. Couldn't resist.)
The sign below could mean either "but" or "different" depending on the rest of
the signs in your sentence:
You can do the sign larger to incorporate the concept of "very." When
doing the sign this large it is obvious that what you mean is
"very different" or a "large difference."