If you are fairly new to smoking MJ then you get pretty high and often can't tell a whole lot about the high. But as you smoke longer you will develop a sense of the way the high affects you. Also, different strains will have different affects. If you pay careful attention to how it is affecting you, you will notice that you feel the high in your head. You will feel more of it in your face and in your vision, and other senses. The other type of high, you will feel in your body more. Your body will often tingle or have a sensation of buzzing. This is often a relaxing type of high that is good for relieving pain and stress. You will still feel it in your head but the 2 are distinctly different.
In many of the hybrid strains today, you will get some blend of both types of high. Sometimes the heady part will hit you first and after a period of time, it will calm down and settle into your body. If you smoke some that makes your head and heart race, and it makes you feel paranoid and uncomfortable, then that is one that was harvested too early and the resin hasn't fully matured. If you harvest while the trichomes are still mostly clear, you will get this effect.
Now if you have a strain that is a hybrid and you take it in the early stages of ripeness, when the trichs are mostly milky with no amber, then you will often get the type of heady high that would come from the one plant. But if you allow the buds to age longer so that you get a lot of amber trichomes, then the high will be more like the other plant.
However, this doesn't always hold true because of the uniqueness of genetic blending. For example; if you have a strain that is a blend of 2 plants that give heady highs, then the high of the hybrid will most likely be some version of a head high even if you allow it to go to mostly amber. The best way to get the type of high that you like best is to take a few buds from a plant in the early stages (when the trichs are 90% milky and no amber), then allow the rest to go until you see about 10% amber, and take some more. Then allow the rest to go until you have about 50% amber. Then you can try all of these and decide if there is enough difference and which you like best.
I have found that for me, I like to let mine go until I get 90% milky and 5-10% amber(if possible) on all of my strains.