Quick questions.

I am from Jamaica (THE CARIBBEAN) which is way closer to USA that Japan and the engines are way cheaper to ship from the US.

My Mazda 6 (Atenza)- Japanese Model Engine was totally damaged, Planning on replacing it with a USA mazda 6 Engine.

Please answer these questions, im trying to understand my car better..

-Whatz the difference between the USA (LHD) Mazda 6 engine and the Japanese Mazda atenza engine
-Would a USA (LHD) mazda 6 engine work in my car(ATENZA).
-Would a USA (LHD) mazda 6 2.3 liter engine fit in my car (ATENZA) and on my atenza subframe.
-is my mazda atenza a low emission or Standard emission car, Which one LOW or STANDARD?
-Is my atenza a COIL PACK or COIL ON THE PLUG system?
-Would i have to change wire lume and computer if i use a USA (LHD) mazda 6 engine?
-Would my atenza A/C compressor and Power steering Pump fit on a USA (LHD) mazda 6 engine.
-Please i need your honest opinion or as someone else who know.

thank You
Orville Sewell