TI 83 Plus Calculator vs. TI 84 Plus Calculator?

for school i have to get a TI 83 Plus calculator... and i wanted a cool colored one. i found a pink one on amazon (im a huge pink fan =) ) but its a TI 84! is there a different between them? and if there is, is it close enough to the TI 83 that i could use it for school?? =/
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