I'll agree with staglinger, the banking in the molded track pieces is only mild.
You probably could get away with it.
The other difference is the banked R3 track pieces are 45 degrees per piece not the 22.5 degrees of a normal R3
I have banked R-3's that I purchased last year, and they're exactly the same as the non-banked with the exception of the inserts on the bottom of the track for the supports. I've banked "non-banked" R-3's and they work just fine.
I have the R2 banked curves and they are only slightly more curved than normal R2's, they do have the different holes underneath for the supports. If you are going to use banked curves and want to use the standard scaley borders with them you will have to bend them to fit as they won't clip straight onto the bent banked curve. You can get different size supports (purchased separately of course) which will change the angle of the banking.
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