Numpty chainring question

Is there a right / wrong way round to fit them? Recently stripped bike for a deep clean and ever since I put the crank back together the up shifting has been pants. To my un-tutored eye both sides of the chain rings look the same but are the teeth different on one side to assist with gear changing? They're Stronglight rings and currently the word 'Stronglight' is facing outwards, can't remember if it was before... :oops:
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There is normally a marker of some type showing the crank arm position.
Pictures of the rings would be good to advise what the mark/feature is.
Parktools :?:SheldonBrown
Any lifting ramps or pins will be on the smaller chainwheel side of the chainwheel.