Worried I’ve bought the WRONG replacement TwinAir engine

I'm a little bit worried that I may have bought the wrong replacement engine for my Fiat 500 TwinAir.

I'm starting to notice that quite a lot of the parts of different, such as the intake manifold, the PCV system, and the idler pulley setup.

Flywheel locking tool: https://www.ccw-tools.com/Product.asp...

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Commonly Used Tools:
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Amazing book I'm using to learn about cars: https://amzn.to/3DMDV0t
3-tonne trolley jack: https://amzn.to/3LrJKD7
Power bleeder for clutch and brakes: https://amzn.to/3J5irwZ
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Rolling toolbox (great for at-home mechanics): https://amzn.to/36BiC5Y
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GoPro Hero 10: https://amzn.to/3NuMKQW
GoPro head mount: https://amzn.to/3uAjtM2
Magnetic mounting system for GoPro: https://amzn.to/3JVf78P
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