FWIW, I was talking to the Ikelite service folks awhile back about this very same question, and basically what I got told is that OEM's are using a wide variety of different materials for their o-rings and there are a lot of different o-ring lubricants being made as well, and the chances of a compatibility match while cross-branding are somewhere between slim and none (and Slim's walking out the door).
I was told that non-compatibility would lead to o-ring stretching and failure so I would be better off to use the Ikelite lube on their o-rings and the Sony lube on my Sony housing o-rings, and not take the risks of mixing.