There is no difference between big and big in form, size, size and quantity. Big and large usually mean beyond normal size, height, weight and length, such as alargehouse and abiggarden.

Big means "important", big is not. Big also means "getting older, growing up and mature", but not big.

Large is more used to mean "quantity (number), scope, scale, capacity, width, proportion, etc." Beyond the average range.

Mostly used for volume, degree and component; Large is often used for area, range and quantity.