You can't get much information from just looking at the IOL power. There are various IOL formulas for predicting the post operative desired residual refractive error. Varibles includ the shap of the cornea, the depth of the anterior chamber, very very important the axial length of the eye, the type of IOL being used and a factor based on the surgeon's experience using that formula for theorectial desired refractive error and actual. If you are interested you might ask your surgeon to show you or print you up a copy of the results of each eye.
In rough terms when a person that has near perfect eyes (prior to cataracts) gets an IOL for distance vision the power used is right around +19.5 D mark. That power does not correct for myopia or hyperopia. It just replaces the power of the natural lens removed. So from that I am assuming the eye that is intended for distance had very good uncorrected distance vision before cataracts and it needed no significant correction.
I am also guessing that the other eye had some modest myopia perhaps in the range of -1.50 D. The "neutral" +19.5 D lens is not going to significantly correct that eye, and leave the myopia pretty much where it was already. If that eye was going to be corrected for full distance then a lower power lens would be used like a +17.5 D or so. But, that is not the intent in this case.
Keep in mind that these are just rough assumptions. In actual practice the eye is precisely measured and the target for outcome is input into a computer program and the computer selects the correct power (hopefully) to get the desired outcome. The bottom line is that because the same power lens was used in each eye, that does not mean the outcome will be the same.
And, the real test of success is getting a refraction done at 5-6 weeks after surgery to see where the eye really lands. The normal target for the monovision you describe is -0.25 D in the distance eye, and -1.50 D in the near eye, if it is mini-monovision.
Hope that helps some