Not sure if I understood correctly but you can get both origins and then check the distance apart which will determine if there was a change. To check all just use a loop with get_players().
PHP Code:
new Float:fOriginBefore[ 33 ][ 3 ];
new Float:fOriginAfter[ 33 ][ 3 ];
pev( id , pev_origin , fOriginBefore[ id ] );
//Same for after origin
new Float:fDistanceApart = get_distance_f( fOriginBefore , fOriginAfter );
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