My research is based on hydroponics and soil-grown plants. The analytical analysis of plants is done through a similar methodology but I have too many results to be added in one paper. For example, just the hydroponics part is already at 12000 words with 10 figures. Soil-grown plants paper is even lengthier. So, I was wondering if I could use the same methodology for the soil-grown plants with of course slight differences in soil analysis. If yes, then do I rephrase the methodology or do I add a reference to my first paper?