Is there any difference in the "feel" when flying different variants of fbw planes?

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Originally Posted by 777Supremecist

Also, why does the A321 require additional line training? Is it due to the tail strike clearance?

Operator specific, but yes. There are bad flare habits (late, snatched flare) that can manifest themselves in flying the A320, which if tried on the A321 would certainly give a hard landing.