Metahuman "A" pose is different from UE mannequin standard?

I’m not an animation expert so I may be off on this, but it looks like the A-Pose for metahumans is just a bit different from the mannequin standard one. The arms are more bent in the forward direction. See attached picture comparing mannequin to metahumans. Are the metahumans supposed to conform to the Unreal mannequin structure?

I’m driving the characters live in realtime with mocap data through LiveLink so I’m not sure what the best way to correct for this is. Any suggestions?