Is granuloma and nodules same thing if seen on lung ct?

Not quite: Many nodules are granulomas but nodules can also be a large variety of tumors or malignant tumors. Followup or biopsies are to determine cause.

Cause: ...Lung nodules — small masses of tissue in the lung — are common, appear as round, white shadows on a chest x-ray or computerized tomography (ct) scan. They're usually about .2 inch (5 millimeters) to 1 inch (25 mm) in size. Larger, such as > 25 mm, is more likely to be cancerous. > 3 cm = mass. Nodules may be caused by tumors or benign causes like granulomas.

Kinda: Grulomas imply benign disease with a high probability is seen on ct. A nodule may be a granuloma or may have malignant characteristics.