Uploaded by Fwelin 
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Description
Could the pony on the right be Shining Armor? His stature and eye color perfectly match, his coat is extremely close to white (and the difference could be chalked up to the lighting), and the difference in ear shape could either be grown out hair or some kind of further modification.
Source
not provided yet
I did forget that his horn wouldn’t fit under there, oops. The coat could be explained by lighting and the ears by magic like the change in eye shape, but the horn not being there means busted theory.
Oh well, haha.
Edited
Plus those ears belong to a batpony, not to an unicorn like Shining Armor.