I am part of 2 collaborations which are more or less competing (in a friendly way though). Since I am the only one direct connection of these two groups (apart from the topic of course) that has now put me into a somewhat strange situation:
Both collaborations are about to submit a paper to an important journal in our area. In one of papers I am actively involved in the writing process, in the other I am actively involved in correcting what has been written by a collaborator. Particularly in this journal, I have the feeling that the paper which is submitted later might be rejected as being no longer the first one - although both papers are using different approaches to get to a similar result. (Of course, I might be wrong and everything goes through smoothly).
My question now: being part of both collaborations, can I tell the other collaboration that their colleagues/competitors are about to submit a paper where I am also involved ? Or would that be ethically not OK ?