The extra weight will make a bit of difference (though how much heavier it is I don't know), but the biggest difference will be in the increased lever arm movement. Because yours is an extra 400mm longer it will be more prone to wind movement and any movement in the mount will be amplified by this longer length. Also balancing the tube fore and aft will be more critical as well. Not saying it won't work, just something to be aware of.
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