Well of course there are differences other than the price. I can't exactly go into any specifics as I am not completely familiar with either, but yes, there are most definately differences.
Well, take it for what its worth but an rl-p and a xxx were compared head to head and with less than 1k w they were pretty close. I cant imagine an se could keep up with it, but who knows, Ive never heard one.
I kno the xmax of the SE is like 18mm compared to the rl-p which i heard was like 25mm, i think is for the updated versions, but on the website they said 24.2, but still less than a mm aint gonna sho