Gamo Redfire vs Predator Polymags .22cal for Gamo Swarm Magnum Pro

Hello everyone
First of all does anyone know if the normal sized Predator Polymags fit the in the magazine of Gamo or can only be singled loaded?

Second of all has anyone shot both of these pellets recently and knows which one is better for accuracy or penetration? I have read that the polymags are better quality in another forum but it was like 15 years ago...

And lastly is there any difference between Predator Polymag normal vs short version except from the length?
 
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