Are oversize or jumbo grips the same thing? Not really, “oversize” is a generic term for a larger grip. Jumbo refers to a grip larger than the midsize in the same model but can vary greatly in size from one manufacturer to the next. No other grip size category has a wider size range so look for the physical size like +1/16”, +1/8”, +11/32”, etc. in the name for the actual size you are ordering.