In cpu power yes, if you aren't playing games or doing much more than just general use (internet, mail, word) then you probably won't notice the difference. If you are looking at an HTPC then the llano chip has a better igp.
Hello,
first of all 3420 is not A4 it's an A6-3420. A4-3420 is a desktop CPU, judging how you're in the mobile section of the forum you probably want to compare apples to apples.
lets take a base i5-2430. Compared to AMD A4-3330 and A6-3420