The way watering soil plants with nutrients generally works is you alternate between feedings (nutes + water) and watering (water only). So every other time the plants need more water, you give them water plus nutrients instead of just plain water. But you shouldn't add anything until the plants are just about dry.
For the most part your feeding concentration will be the same in soil or hydroponics. Soil just retains more of the nutrients longer so if you feed every watering you'll end up with far too much nutrients in the soil and your plants will get burned.
So the short answer is "yes, you use the same concentration". However, most people use less than the recommended dosage in hydroponics, which means you will probably want to use less in soil, too. I would recommend starting at HALF strength, if your plants are not seedlings. If they are, start at 1/8th to 1/4th strength.
If your soil is already rich in nutrients, dial it down even further.
If you have an EC or PPM meter, use it. Take a reading on the nutrient solution before you give it to your plants, and then give them enough so that a small amount runs out the bottom. Collect that, and take a reading on it as well. The ppm of what you collect will most likely be higher, and that's what your plants are actually getting. So make sure that number isn't too high or else you'll have to flush them with plain water to get it down to a safe level.
Use a notebook or something to keep track of your before/after numbers each time - including when you give them plain water. You want to make sure you're not getting salt build-up in your soil which you'd see by the after numbers gradually getting higher and higher compared to the before numbers. Easy way to do that is after you write down the before/after numbers, subtract before from after and write down that number so you know how much you gained from the soil. So like if you get 100ppm more in the run off the first week and 200ppm more the next week, you know your soil is building up more nutrients and you need to feed a weaker solution to counter-balance that.
All of this may sound pretty complicated, but it's not really. And if you want to risk it you can skip all this and just do light feedings every other watering and hope for the best. 9 times out of 10 that will work fine without extra supervision and testing, but if you want to play it safe you need to track the ppms. pH too, if you can.
Oh, and the thing that says to use a higher dose if you have Piranha and Tarantula is the Carboload. It's basically carbs for your plants - great stuff - and both Piranha and Tarantula are beneficial microbial additives that also need food to thrive. Those bennies will eat the Carboload to grow up big and strong, which is why you want to give your plants extra carbs if you're also using the bennies. That way you have enough for the plants, and the bennies, and no one goes hungry.
