In general the die markers would help to tell dies apart. On a cent with an S or D mint mark you could also check locations of mint marks in addition.
In addition to Lincolncentresource a site like coppercoins, doubledie or varietyvista might have more photos and notes to show those markers and maybe a different die stages eds, mds, lds.
You can also post pictures here and people are always happy to help.
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