It had also been my impression that the internationally-configured ER's were all Pratt powered. AA757 had said the recent deliveries were GE. While we await a definitive clarification, I will add that some of the domestically-configured (GE) 767-300s are technically ERs, but have the same two-class config as the earlier ones, and fly North America. If I'm not mistaken, these began with fleet number 130 (N130DL, etc.). If need be, I suppose they could be given Business Elite and sent off to Europe!
LH423, I'm curious to know whether you have direct hands-on experience that makes you pick GE over Pratt for the 767-300. Not that I mind, but it is always interesting to hear from and insider. Personally, I'd put RR on mine.