Haven't tried to do that, but I hope somebody else can answer your question because I would be interested to know. Are the addresses on both accounts identical? That was a problem with the takeover by British Airways of bmi, when people were transferring miles from Diamond Club to BAEC.
Back to the Iberia Groupon deal, and both mileage packages I purchased, 2,000 and 10,000 miles, have posted to my account twice. Now, I am assuming that this is a mistake that they're eventually going to see and correct. So, I'm trying not to get excited about it!