Is there a difference between KILZ and Kilz 2?

Is there a difference between KILZ and Kilz 2? Yes, there is difference between KILZ Original and KILZ 2 All-Purpose. KILZ Original is oil-based primer with strong stain-blocking and odor-blocking properties, very effective for severe stains like smoke, fire damage, water stains, and pet odors, with strong smell and requires mineral spirits cleanup and longer dry time, good for interior and exterior but high VOC. KILZ 2 All-Purpose is water-based latex primer, lower odor, easier cleanup with soap and water, good for general priming, light to medium stains, drywall, wood, masonry, and can be used under latex paint, but not as strong for heavy smoke or fire stains as oil-based original. KILZ Original seals better for severe odor and stain, while KILZ 2 is more user-friendly for everyday projects, low odor, fast drying, suitable for most interior jobs. There are also other KILZ variants like KILZ 3 Premium, KILZ Mold and Mildew, each with specific features. So difference is base chemistry, oil versus water, stain-blocking strength, odor, cleanup, and recommended use cases, with original for heavy-duty and KILZ 2 for general purpose.