I don't think it is ever a good practice to shock the yeast with cold to warm and dry to wet having a bad effect on the cell walls. That being said, I truly have no idea about warm to cold. If it were me, I would just wait for one or the other. Bring the warm yeast in the garage to get cold and if you forget, then bring the cold wort in the house to warm up. If you are sanitizing well, there should be no problems.