Both are Mesmer skills, both mimic the next spell you use so you can use it two times for 20 seconds. This doesn't sound so powerful at the start, but can get real nasty with the right spells.
The difference between Arcane Echo and Echo is (besides the later being an elitespell and costing less energy) the capability to mimic signets and skills alike (Echo) not just spells.
Both Spells are unlinked, so no matter how high or low your attribute in the mesmer skills is it just won't change the way these two spells work. But be careful, in the timespan between Echo Spell and second spell it does count as an enchantment which can get removed. But as soon as your second spell is cast, echo replaces itself with it and you can use it alike.
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