Not necessarily. IP ratings are protection classifications established under IEC 60529. The first digit indicates protection against solid foreign objects and dust, while the second digit indicates protection against liquids. IP65 and IP66 both include dust-tight requirements, but their liquid test conditions differ; IP66 has more stringent requirements for protection against water jets than IP65.
If a product is labeled IP65 Front Bezel or Front Panel IP65/66, this generally means that the protection applies primarily to the front bezel or front panel. It cannot be assumed that the device's rear, I/O connectors, power connectors, cables, and interior provide the same level of protection. Nor does it mean that the device can be immersed in water without restriction or cleaned with high-pressure water jets.
Some ELGENS military platforms can provide IP65+ or IP67 protection. For example, X-Corleone is officially rated IP67; however, the actual protection rating, scope of testing, and installation requirements must still be verified against the complete model designation and official documentation.