Yes ,they are exactly the same ,I did some more testing and the problem seem to be only for the F-15.
I tried with two Mig-29S ,the AI went up much steeper than me with no problems ,but I managed to climb much slower 10-15 degree up to 16000 and 5-10 degree up to 17500m.
I tried the same with F-15 ,but it stalled out at around 13000m ,and refused to gain speed even at level flight.
If I try to follow AI path ,the F-15 loose speed and stall before 10,000m
Edit;
I tried again ,and finally managed to climb higher ,but I needed to dive below 10000m to gain speed ,and then I tried climbing very slow (3-5 degrees) ,and i managed to climb very high ,64500 feet or above 19000m ,but i imagine it was like flying a U2 with very small speed/climb envelope ,all the way up ,from 11000m.
Is this realistic ,or will it change in 2.0?