In RTK1 the kanji for 喩 is made with a blade primitive, whereas on the computer and on Jisho.org it is represented with 2/3 of the flood primitive.

I suppose I should use the character from the dictionary in my flashcards, but I'm curious nonetheless.

They are variants of the same basic character, and change with the font that's in use. The one with the partial "flood" is an older form, I believe.

(Careful which names you use for the bits for best luck. 刀 That's sword/dagger 刃 that's blade and 刂 is saber)

A lot of the edge characters, and 喩 is one, having only has only recently been added to the 'standard character' list, appear different depending on font.

刖 is actually an old character by itself, and the old versions of characters with the old version of (入一月くく) were simplified to resemble 刖 and 前.

Notice also that the old form also has 入+一on top and not 亼(?+一). And the meet/moon looks different as well.

Finally found them:
1. 兪 Traditional shape
2. 俞 Shape that became to match (刖 and 前)

Both 1 and 2 are not stand alone character in Modern Japanese. 兪 is (apparently) a name in Taiwan, and 俞 a name in Mainland China.