Problem: (1) Between 1900 and 1915 , additional tracks for local traffic were reserved , with the existing tracks being built for transit trains .
(2) Between 1900 and 1915 additional tracks were reserved for local traffic with the existing tracks being built for through trains .

Do (1) and (2) mean the same thing?
A: yes

Problem: (1) In Tuscany , Leopold II instituted a liberal constitution and sanctioned a liberal ministry .
(2) In Tuscany , Leopold II inserted a liberal constitution and sanctioned a liberal ministry .

Do (1) and (2) mean the same thing?
A: yes

Problem: (1) The combination of warm surface waters and cold , deeper waters supports a high biodiversity .
(2) The combination of cold surface waters and warm deeper waters supports a high level of biodiversity .

Do (1) and (2) mean the same thing?
A: no

Problem: (1) This heavier radioactive isotope may be new depending on the chemical element ( stable or unstable ) .
(2) This new heavier isotope can be stable or unstable ( radioactive ) depending on the chemical element involved .

Do (1) and (2) mean the same thing?
A:
no