Whats the difference between blues and the form AABA in jazz?

thats about it

Blues is a general genre of music and a basic chord progession that people have taken and changed in many different permutations. AABA is a way fo describing the form of a piece, and can be applied to the blues form, or other forms too.

That's a non sequeter.

Blues is usually a 12 bar form and AABA has an A section twice, a B section (the bridge), and repeats the A section again. The blues usually consists of lots of 7th chords (dominant) and AABA usually consists of many different types of chords and progressions like II V I. It can get complicated. If really want to learn about things like that I'd recommend The Jazz Theory Book by Mark Levine. It's great.

Blues is a 12 bar form. It can take an enormous variety of formats the only common link being that you have a IV chord in bar 5. Traditionally, it's something like I IV I I IV IV I I V IV I V.

AABA is generally a 32 bar form in 4 8-bar sections, labelled A A B and A. The A sections are very similar melodically and harmonically. The B section contrasts markedly, often temporarily modulation or sitting on the subdominant.

Edit: An example of a blues progression that is as far from traditional as possible but is still hearable as blues:

|F#m7(b5) B7 |Bb7 A7 |Ebm7 Ab7 | Db7 C7|
|F7 |Fm7 Bb7 |Em7 A7 |Ebm7 Ab7|
|Dm7 |C#m7 F#7 |Cm7 F7 |B7 E7 |