Rating of these two plugs is the same, so no issues there.
The OEM plug has a 1.3mm gap, with platinum pad on the centre electrode.
The replacement plug is , I understand, a Copper cored centre electrode design. The gap may/should be 1.3mm.
The difference in the designation for suppression is the the AYRF plug was UK manufactured, whereas the AYSF is USA mfd.
Same suppression on both plugs.
Provided these AYSF plugs have 1.3mm gap, you should be OK. Service life should be at least 20,000 miles if you drive at WOT most of the time.
All in my opinion of course!
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Correct Spark plug fiesta 1.25? 
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