Glossary entry (derived from question below)
Spanish term or phrase:
con el paso de los años o zonas pueden surgir variantes que afecten a conjuntos
English translation:
with the passing of time, or (with) zone changes, variants...
Spanish term
con el paso de los años o zonas pueden surgir variantes que afecten a conjuntos
Las correspondencias no son tan claras y evidentes debido a que con el paso de los años o zonas pueden surgir variantes que afecten a conjuntos de símbolos.
I have the following but I know it's incorrect.
The correspondence isn't so clear or evident because of the fact that with the passing of time or area which affect sets of symbols, variants can arise
Apr 5, 2010 14:51: mediamatrix (X) Created KOG entry
PRO (1): Muriel Vasconcellos
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Proposed translations
Chile
Human-scale Globalization
Native in: English (Variant: British) 
Works in: Spanish to English, French to English, English to Spanish, and 2 more.
with the passing of time, or (with) zone changes, variants...
'zonas' refers to 'zones' which serve to classify the perceived relevance of historical data
Case-based reasoning: research and development : first ... - Resultado de la Búsqueda de libros de Google
Manuela Veloso, Agnar Aamodt - 1995 - Computers - 576 páginas
Instances of S are initially placed into the atypical Zone. ... This is a lost case */ Remove this instance from this zone Add it to the atypical zone ...
books.google.cl/books?isbn=3540605983...
English to Spanish Translator
Native in: English (Variants: US South, British, UK, South African, US, Australian, Canadian, New Zealand) , Spanish (Variants: US, Ecuadorian , Cuban, Latin American, Paraguayan, Standard-Spain, Nicaraguan, Colombian, Uruguayan, Guatemalan, Panamanian, Peruvian, Honduran, Chilean, Venezuelan, Costa Rican, Dominican, Mexican, Salvadoran, Puerto Rican, Bolivian)
Works in: English to Spanish, Spanish to English, Spanish, and 1 more.
over the years or in areas variants may arise affecting sets of symbols
United States
Each translation a gem!
Native in: English (Variant: US) 
Works in: Spanish to English, Portuguese to English
variations can develop over time and between geographical areas that affect the sets [ ...
Based on the context, I think this is a case of 'variations' rather than 'variants'. The 'variants' emerge, but it's the 'variations' that develop and have the power to affect (variation theory).
Discussion