difference in size can be caused by the different compression type. just as ZIP or RAR or ARJ will give you each different filesize in the end when you compress the files.
well have you tried copying it back on CD (making a CD out of the image)? if that works with no problem then it's ok. if both work you can keep just one.
i don't really see any big difference between except that certain file types might need certain programmes to run. like .nrg is more suited to nero, but iso will do just fine there as well.
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Crantius Colto: Fear not. You are safe here with me.
Lifts-Her-Tail: I must finish my cleaning, sir. The mistress will have my head if I do not!
Crantius Colto: Cleaning, eh? I have something for you. Here, polish my spear.
Lifts-Her-Tail: But it is huge! It could take me all night!
Crantius Colto: Plenty of time, my sweet. Plenty of time.
From The Lusty Argonian Maid by Crassius Curio found in TES3: Morrowind
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