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PRF7Z-TG vs PRF6E-10?

  CLio 172
Hey guys I have a clio 172 phase 1 and just checked my spark plugs. The previous owner have used the PRF7Z plugs which are the stock plugs for the clio 197 I believe.

Is there any difference in these plugs and should I change them out for the standard PRF6E-10 plugs? Thank you