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Yes, a 19" will successfully fill in for a 20" rim, if you keep to the OEM tire sizes. What matters is the tire circumference (function of tread width and sidewall aspect ratio) when mixing tire sizes side-to-side or (for xDrive) front-to-rear.
The challenge you potentially run into in putting a 20" rim on the front is clearance to either the shock tower or inner fender when turning the steering wheel to full lock. Given the spare is temporary, best just not to bother with any 20" rim.
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