That's like saying ip57 is equal to ip68. The u11 can literally be placed under water for 30 min up to 1 meter. The op5 cannot.
This is going to come off as a rant.
IP67 vs IP68, and for normal usage they are identical. It is still, even with a water resistance rating of any kind below IP69K, completely idiotic to intentionally expose a computer to water. IP67 is depths up to 1M. IP68 is depths above 1M. Most people ignore the conditions of the test which are:
Device powered off or in deep sleep
Room temperature water
Still water (no jets or current or other movement)
Tap water (no chemicals such as chlorine, sand, mud, etc)
And people want to jump in and take photos under water because of evil marketing commercials. None of these devices are tested in or certified against the ocean, any lake or river or even stream, any swimming pool, any hot tub, etc. They're not tested in or certified in a spilled beer or orange juice, etc, etc.
So how many times have you dropped you phone, while powered off or in deep sleep, into a bowl of still standing room temperature tap water? Because that's the only thing that is tested and certified against.
/End of Rant
Yes, the OP5 can. Apparently.