If the tanks are the same water parameters & close to each other, just net them & walk them over. I've done this with tanks that are a couple of degrees different in temperature without a problem. All but one of my tanks are downstairs, if I transfer fish to or from the upstairs tank, a large cup, or a bucket for larger fish works best.
Unless the tanks vary widely in temp, pH, or hardness, you should be fine putting them right in. One of the tricks for getting many fish to spawn is to do a water change with cooler, softer water. This imitates the rainy season in many areas, triggering spawning.