Difference in self discharge rate between Lithium iron phosphate battery vs Lithium Polymer Battery
You can look at similar parts' datasheets and white papers to get an indication of the typical self-discharge rates for the style of LiPo and LiFePO4 cells you are considering. Typically, both the LiPoly and LiFePO4 types have self-discharge rates roughly less than 5%/month when stored under ideal temperature and state-of-charge conditions. With the limited amount of infomation on the particular parts you are asking about, it is not possible to find the difference between the two chemistries with respect to self-discharge. 

One more thing to consider is that things like self-discharge can be quite variable, depending on how well the manufacturer can maintain a cell-to-cell and lot-to-lot consistency in the process. Even with this, the conditions that your device will be subjected to may cause a cell to change, and you will either want to design to mitigate these conditions or factor in some allowance for capacity dropping over time, and self-discharge increasing.