Hi, thanks for your question. I believe they are simply different exam boards.
I have found this explanation which may help:
'CIE A Level' refers to A Level by Cambridge International Examinations (CIE), while 'UK A Level' collectively refers to A Level by Edexcel, AQA, OCR and all other UK examination boards except CIE. ... UK A Level is intended for students in the UK, while CIE A Level is intended for students outside the UK