Should we get the exact same rim for our 2010 Toyota Sienna AWD to use for a spare tire?

You don't need the exact wheel but you do need the same size tire as the others.

Thanks and we should have been clearer on our question. Right now the rims have regular tires on them (NOT RFT's). So what you are saying is that we can get a rim that's NOT the same as our other four rims on the van (of course with the same number of lugs and size) and with of course the same tire size and be okay with using as a spare in case of a flat and that the AWD will be fine. Correct? Also when we contacted a Toyota dealer/repair shop, they were telling us NOT to do that and to beware of where we purchase rims. In your opinion are they just trying to make more money by having us purchase Toyota products or is there some truth to that? Do you have any suggestions on where we can get the correct third party rim since we already have a brand new tire for it?