The seed will keep a similar style to what you have previously seen as the results. So, if you do a completely different prompt, then you might get some similar primary features or a similar style, even though the prompt is different. You will have to play around with the prompts with a same seed. Like do three different prompts with a seed that has produced results you like prior to running your test runs.
Seeds, to me, are the biggest mystery of this whole process. I have no idea where the seeds come from or why using the same one creates some continuity in a baseline... but once you know, the same seed creates similar results... then whe you find good results, perhaps save that seed and try it out again on completely different prompts and see what you can come up with!