Taste side by side. Do a 3 by 3. For example, 3 different grapes from the same vineyard, then 3 of each of the same variety from different vineyards. See the differences and commonalities. It may help if you try other fruits they're compared to. For example, Gewurstraminer tastes like lychee. If you taste lychee, this becomes really obvious. The really aromatic ones are the easiest to tell apart in my opinion. You can't mistake a Muscat for a Gewurstraminer. It would be like mistaking pear juice for apple juice.
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Taste side by side. Do a 3 by 3. For example, 3 different grapes from the same vineyard, then 3 of each of the same variety from different vineyards. See the differences and commonalities. It may help if you try other fruits they're compared to. For example, Gewurstraminer tastes like lychee. If you taste lychee, this becomes really obvious. The really aromatic ones are the easiest to tell apart in my opinion. You can't mistake a Muscat for a Gewurstraminer. It would be like mistaking pear juice for apple juice.