The navi plus unit you have been offered will not fit into the dash, the A4 and A6 are different fittings.
Plus you would need to completely rebuild the dash of your A4 to convert it from single din (concert II) to double din for Navi plus.
Not difficult, but a bit daunting if you have not done one before.
I offer an installation service, but I'm in the Northwest UK, where are you?
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