Hate to be the bearer of bad news, but the one person I know with a GNR with a Japanese ROM says it doesn't drive his shaker. His is imported from Japan.
DE added motors to those games to help them clear whatever standards Japan had in place, so they could copy a previous game design. The japanese games also had some additional motors just scattered around the game for that reason. And apparently, they didn't all work.
Some pictures are here;
http://www.pinballmadness.net/collections/main.php?g2_itemId=20994&g2_page=2
