Re-encoding MP3 into AAC

I have lots of 256 kbps MP3 musics. I am thinking of reducing file size so I can put more music into my iPod shuffle. If I just convert those MP3 to 196 kbps AAC, will the converted file be the same quality as ripping CD with the same 196 kbps AAC encoding? Thanks!

Thx StarDeb for respondig. The MP3 was made by a friend from his personal collection of CDs. The disc he used was a CD-R 52X 700 MB /80Min.
I was able to copy the music on to iTunes, it is in my Library now, and I can play it fine. However when I try and select this MP3 list of songs from my library to the Mini, it does not happen. I usually have no problem in selecting an creating new play lists on my mini from my Itunes. The starnge part is that 3 of the songs in the selection get transferred, always the same 3.
So my question is: does the IPOD MINI not able to get songs in the MP3 format. Do I have to change them to something else? I was researching on their site and from what they said the IPOD can play songs encoded with MP3 (from 32Kbps to 320Kbps)-whatever that means.
Does this help? Please help!

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