I am about to submit a 3.000 words article. It needs to be submitted soon, and I will have to submit it, but I know that I could flesh this out much more, and arrive at something with around 7.000-10.000 words, if I had more time. However, the basic idea would remain the same. It would be much more detailed, but I would not be making a completely different point.
Could I publish the 3.000 words article in journal A (if accepted), and then later this year publish the 8.000 words version in journal B?