Edc, edt, etc. do not refer to an absolute scale, so an edc of a perfume could actually be more concentrated than an edt of another perfume. More importantly, the strength of a perfume depends on the type of the ingredients used: some ingredients are very loud at minimal doses, and viceversa. So you shouldn't worry too much about this. Each perfume should be tested on its own to judge longevity and intensity.
Besides, almost no perfume comes in different concentrations anymore, especially masculine ones. There's only one (for masculines typically corresponding to an edt). In the very few cases where this happens, we're more in the case of "flankers", because they are different in smell, it's not just a matter of concentration.
There are still some feminines that come in different concentrations (especially for traditional brands like Chanel or Guerlain), and usually the edp is more intense than the edt. But in this case, again, also it's just not a matter of concentration, but the formulas are slightly different, typically edt have a fresher, lighter feel than the edp.