в той же степени, в которой оно заботилось бы о ведении своих собственных дел law

[Alex16]

При этом в обязанности ЗАО ___ входит "забота о делах" ОАО _____ " в той же степени, в которой оно заботилось бы о ведении своих собственных дел

to the same extent to (?) which it would take care of its own affairs?

in the same degree of care in which it would take care of its own affairs?

[yulashka]

может, так:
the degree of care of the OAO affairs shall be (at least) the same as applied by it when managing its own

[Alex16]

нашел примерно так: with the same degree of care as it would apply (use) in its own affairs...