I'm trying to lose weight again. i'm 5'5.5 feet fall & 155 pounds. i lost 13 pounds so far 6 months postpartum(baby #2, i was 136lbs before) if i eat 1700 cals and burn 400 with excercise in the morning. is that the same as if i consumed only 1300?

There are calories being used during light activities during the day as well, but otherwise the ratio should be kept as close as possible to a daily negative balance.

Since one's metabolic rate can vary, if you can continue on a low calorie ("1700 cal.") and maintain exercise at a "400 cal." rate (which will require long rapid walking, or dynamic muscular activity, such as swimming or running), the caloric balance will approach "1300", but this takes patience and discipline to maintain.

You will need to reduce your consumption as you lose weight. It is better to not make up for the caloric loss from exercise with food.