A same meaning or not problem:
This would stop the element but fade if the effect is 80 % complete ( with an opacity of 20 % ) .
This would fade the element but stop when the 80 % effect is complete ( with an opacity of 20 % ) .
****
[A]: no

A same meaning or not problem:
When taken with fatty food , highest plasma concentrations are reached after two hours , and the area under the curve is increased by 40 % .
The highest plasma concentrations are reached after two hours , when the fatty food is taken and the area under the curve is increased by 40 % .
****
[A]: yes

A same meaning or not problem:
Jones held the electorate until 1946 , when it was abolished , and successfully stood in St Kilda this year .
Jones stood the electorate until 1946 , when it was abolished , and successfully held in St Kilda that year .
****
[A]: no

A same meaning or not problem:
Of the registered voters in the county , 13,474 were Democrats , 12,218 were Republicans and 15,887 were not affiliated with any party .
Of the registered voters in the county , 13,474 Republicans , 12,218 were Democrats , and 15,887 were not affiliated with any party .
****
[A]:
no