No.
A spanner with numbers on the handle that's been heated, frozen, vibrated and has an out of date calibration certificate in your tool box at home is just a spanner with numbers.
Don't kid yourself otherwise.
The only things that need one are staged bolt patterns like cylinder heads.The numbers in manuals are put there by lawyers and warranty people to avoid giving gorillas with ten foot extension bars free stuff. I know, I write the odd manual.
My favourites are the workshops that fetch the wrench back from propping the fire door open, wait for the click, then give it half a turn for luck
Use the spanners of the length provided. Those clever Victorians made a half inch Whitworth AF whatever 9 inches long because your average human provides roughly the right torque at that length. Modern tools retain the tradition in traditional styles of hand tool. If things drip give them a tweak.
Andy
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